## NAME

         xlock - Locks the  local  X  display  until  a  password  is
         entered.

## SYNOPSIS

         xlock [ -help ] [ -version  ]  [  -resources  ]  [  -display
         displayname  ] [ -visual visualname ] [ -name resourcename ]
         [ -mode modename ] [ -delay usecs ] [ -batchcount  num  ]  [
         -count  num ] [ -cycles num ] [ -ncolors num ] [ -size num ]
         [ -saturation value ] [ -erasemode modename ] [  -erasedelay
         usecs  ] [ -/+allowaccess ] [ -vtlock modename ] [ -/+nolock
         ] [ -/+inwindow ] [ -/+inroot ] [ -/+remote ] [ -/+mono ]  [
         -/+allowroot ] [ -/+debug ] [ -/+description ] [ -/+echokeys
         ] [ -echokey echokey ] [ -/+enablesaver ] [ -/+resetsaver  ]
         [  -/+grabmouse  ]  [  -/+grabserver  ]  [  -/+install ] [ -
         /+mousemotion  ]  [  -/+sound  ]  [  -/+timeelapsed  ]  [  -
         /+usefirst  ]  [  -/+verbose  ] [ -nice level ] [ -lockdelay
         seconds ] [ -timeout seconds ] [ -font fontname ]  [  -plan-
         font  fontname  ]  [ -bg color ] [ -fg color ] [ -background
         color ] [ -foreground color ] [ -username string ] [  -pass-
         word  string  ]  [  -info  string  ]  [ -validate string ] [
         -invalid string ] [ -geometry geom ] [ -icongeometry geom  ]
         [  -glgeometry  geom  ]  [  -/+wireframe  ] [ -/+showfps ] [
         -fpsfont fontname ] [ -/+fpstop ] [ -/+use3d  ]  [  -delta3d
         value ] [ -none3d color ] [ -right3d color ] [ -left3d color
         ] [ -both3d color ] [ -program programname ] [ -messagesfile
         formatted-filename  ]  [  -messagefile filename ] [ -message
         string ] [ -messagefont fontname ] [ -bitmap  filename  ]  [
         -cpasswd  crypted-password  ]  [  -forceLogout  minutes  ] [
         -logoutButton minutes ] [ -logoutButtonLabel textstring ]  [
         -logoutButtonHelp  textstring  ] [ -logoutFailedString text-
         string ] [ -/+dtsaver ] [ -modulepath path  ]  [  -locksound
         string  ]  [  -infosound  string  ] [ -validsound string ] [
         -invalidsound string ] [ -startCmd string ] [ -endCmd string
         ] [ -pipepassCmd string ] [ -logoutCmd string ]

## DESCRIPTION

         xlock locks the X server till the user enters their password
         at  the  keyboard.   While  xlock is running, all new server
         connections are refused.  The screen saver is disabled.  The
         mouse  cursor  is  turned  off.  The screen is blanked and a
         changing pattern is put on the screen.  If a key or a  mouse
         button is pressed then the user is prompted for the password
         of the user who started xlock.

         If the  correct  password  is  typed,  then  the  screen  is
         unlocked  and  the  X  server  is restored.  When typing the
         password Control-U and Control-H  are  active  as  kill  and
         erase  respectively.   To return to the locked screen, click
         in the small icon version of the changing pattern.
         In  the  lower  part  of  the  password  screen  a  text  is
         displayed.  This message is taken from the first file of the
         following that exists:   $HOME/.xlocktext,  $HOME/.plan,  or
         $HOME/.signature.

         On systems which support new BSD style  authentication,  the
         password may be prefixed by an authentication style followed
         by a colon (i.e. "style:password").  See  the  login.conf(5)
         for more information on authentication styles.

## NOTE ON ETIQUETTE

         Xlock should not be used on public terminals when there is a
         high demand for them.

         If you find a  public  terminal  that  has  been  locked  by
         another user and there are no other terminals available, and
         the terminal appears to have been  left  idle  for  a  while
         (normally  more than 15 minutes), it is fair to try to reset
         the session in some manner.

## OPTIONS

         -help
              Print options and a brief description to standard  out-
              put.

         -version
              Print version number (if >= 4.00) to standard output.

         -resources
              Print default resource file to standard output.

         -display displayname
              The display option sets the X11 display to lock.  xlock
              locks all available screens on a given server, and res-
              tricts you to locking  only  a  local  server  such  as
              unix:0,  localhost:0,  or :0 unless you set the -remote
              option.

         -visual visualname
              visualname which is one of  "StaticGray",  "GrayScale",
              "StaticColor",        "PseudoColor",       "TrueColor",
              "DirectColor", or "default".  default used to  set  the
              screen's  default  visual  (the visual of the root win-
              dow).

         -name resourcename
              resourcename is used instead of XLock when looking  for
              resources to configure xlock.

         -mode modename
              As of this writing there are over 90 display modes sup-
              ported  (plus  one  more for random selection of one of
              these).

         ant     Shows Langton's and Turk's generalized ants.

         ant3d   Shows 3D ants.

         apollonian
                 Shows Apollonian Circles.

         atlantis
                 Shows  moving  sharks/whales/dolphin.   May  not  be
                 available depending on how it was configured.

         atunnels
                 Advance GL tunnels screensaver.  May not  be  avail-
                 able depending on how it was configured.

         ball    Shows bouncing balls.

         bat     Shows bouncing flying bats.

         biof    Shows 3D bioform.

         blot    Shows Rorschach's ink blot test.

         bouboule
                 Shows Mimi's bouboule of moving stars.

         bounce  Shows bouncing footballs.

         braid   Shows random braids and knots.

         bubble  Shows popping bubbles.

         bubble3d
                 Shows Richard Jones's GL bubbles.  May not be avail-
                 able depending on how it was configured.

         bug     Shows Palmiter's bug evolution and a garden of Eden.

         clock   Shows Packard's oclock.

         coral   Shows a coral reef.

         crystal Shows polygons in 2D plane groups.

         daisy   Shows a meadow of daisies.

         dclock  Shows a floating digital clock or message.

         deco    Shows art as ugly as sin.

         demon   Shows Griffeath's cellular automata.

         dilemma Shows Lloyd's Prisoner's Dilemma simulation.

         discrete
                 Shows various discrete maps.

         dragon  Shows Deventer's Hexagonal Dragons Maze.

         drift   Shows cosmic drifting flame fractals.

         cage    Shows the Impossible Cage, an Escher-like GL  scene.
                 May not be available depending on how it was config-
                 ured.

         euler2d Shows a simulation  of  2D  incompressible  inviscid
                 fluid.

         eyes    Shows eyes following a bouncing grelb.

         fadeplot
                 Shows a fading plot of sine squared.

         fiberlamp
                 Shows a Fiber Optic Lamp.

         fire    Shows a 3D fire-like image.  May  not  be  available
                 depending on how it was configured.

         flag    Shows a waving flag image.  This may be  text  or  a
                 graphic  image.   Default  text  is the hostname and
                 operating system.

         flame   Shows cosmic flame fractals.

         flow    Shows dynamic strange attractors.

         forest  Shows binary trees of a fractal forest.

         galaxy  Shows crashing spiral galaxies.

         gears   Shows GL's gears.  May not be available depending on
                 how it was configured.

         glplanet
                 Animates texture mapped sphere (planet)

         goop    Shows goop from a lava lamp.

         grav    Shows orbiting planets.
         helix   Shows string art.

         hop     Shows real plane iterated fractals.

         hyper   Shows spinning n-dimensional hypercubes.

         ico     Shows a bouncing polyhedron.

         ifs     Shows a modified iterated function system.

         image   Shows randomly appearing logos.

         juggle  Shows a Juggler, juggling.

         julia   Shows the Julia set.

         kaleid  Shows Brewster's Kaleidoscope.

         kumppa  Shows kumppa.

         laser   Shows spinning lasers.

         life    Shows Conway's game of life.

         life1d  Shows Wolfram's game of 1D life.

         life3d  Shows Bays' game of 3D life.

         lightning
                 Shows Keith's fractal lightning bolts.

         lisa    Shows animated lissajous loops.

         lissie  Shows lissajous worms.

         loop    Shows Langton's self-producing loops.

         mandelbrot
                 Shows mandelbrot sets.

         marquee Shows text.

         matrix  Shows the matrix.

         maze    Shows a random maze and a depth first  search  solu-
                 tion.

         moebius Shows the Moebius Strip II, an Escher-like GL  scene
                 with ants.  May not be available depending on how it
                 was configured.

         molecule
                 Draws molecules, based on coordinates from PDB (Pro-
                 tein Data Base) files.

         morph3d Shows GL morphing polyhedra.  May not  be  available
                 depending on how it was configured.

         mountain
                 Shows Papo's mountain range.

         munch   Shows munching squares.

         noof    Shows SGI Diatoms.

         nose    Shows a man with a big nose runs around spewing  out
                 text.

         pacman  Shows Pacman(tm).

         penrose Shows Penrose's quasiperiodic tilings.

         petal   Shows various GCD Flowers.

         petri   Shows a mold simultation in a petri dish

         pipes   Shows a  self-building  pipe  system.   May  not  be
                 available depending on how it was configured.

         polyominoes
                 Shows attempts to place polyominoes into  a  rectan-
                 gle.

         puzzle  Shows a puzzle being scrambled and then solved.

         pyro    Shows fireworks.

         qix     Shows spinning lines a la Qix(tm).

         roll    Shows a rolling ball.

         rotor   Shows Tom's Roto-Rooter.

         rubik   Shows an auto-solving  Rubik's  Cube.   May  not  be
                 available depending on how it was configured.

         sballs  Shows balls spinning like crazy in GL.  May  not  be
                 available depending on how it was configured.

         scooter Shows a journey through space tunnel and stars.

         shape   Shows stippled rectangles, ellipses, and triangles.

         sierpinski
                 Shows a Sierpinski's triangle.

         sierpinski3d
                 Shows a Sierpinski's gasket.

         slip    Shows slipping blits.

         solitare
                 Shows Klondike's game of solitare.

         space   Shows a journey into deep space.

         sphere  Shows a bunch of shaded spheres.

         spiral  Shows a helical locus of points.

         spline  Shows colorful moving splines.

         sproingies
                 Shows Sproingies!   Nontoxic.   Safe  for  pets  and
                 small  children.   May not be available depending on
                 how it was configured.

         stairs  Shows Infinite Stairs, an Escher-like GL scene.  May
                 not be available depending on how it was configured.

         star    Shows a star field with a twist.

         starfish
                 Shows starfish.

         strange Shows strange attractors.

         superquadrics
                 Shows 3D mathematical shapes.  May not be  available
                 depending on how it was configured.

         swarm   Shows a swarm of bees following a wasp.

         swirl   Shows animated swirling patterns.

         t3d     Shows a Flying Balls Clock Demo.

         tetris  Shows an autoplaying tetris game.

         text3d | text3d2
                 Shows 3D moving texts.

         thornbird
                 Shows an animated Bird in a Thorn Bush fractal map.

         tik_tak Shows rotating polygons.
         toneclock
                 Shows Peter Schat's toneclock.

         triangle
                 Shows a triangular mountain range.

         tube    Shows an animated tube.

         turtle  Shows turtle fractals.

         vines   Shows fractal-like vines.

         voters  Shows Dewdney's Voters.

         wator   Shows  Dewdney's  Water-Torus  planet  of  fish  and
                 sharks.

         wire    Shows a random circuit with 2 electrons.

         world   Shows spinning Earths.

         worm    Shows wiggly worms.

         xjack   Shows Jack having one of those days.

         xcl     Shows a Control Line combat model race

         blank   Shows nothing but a black screen.  Does not show  up
                 in random mode.

         bomb    Shows a bomb and will autologout after a time.  Does
                 not  show  up  in  random  mode and may be available
                 depending on how it was configured.

         random  Shows a random mode from  above  except  blank  (and
                 bomb).

         -delay usecs
              The delay option sets the speed at which  a  mode  will
              operate.   It simply sets the number of microseconds to
              delay between batches of animations.  In blank mode, it
              is  important  to  set  this  to  some  small number of
              seconds,  because  the  keyboard  and  mouse  are  only
              checked  after  each delay, so you cannot set the delay
              too high, but a delay of zero would needlessly  consume
              cpu  checking  for  mouse and keyboard input in a tight
              loop, since blank mode has no work to do.

         -count num
              The batchcount option sets number of things to  do  per
              batch to num .
              In ant and ant3d modes this refers the number of ants.

              In apollonian mode it is the number of possible ways to
              imbed  circles  within  a circle, all of integer curva-
              ture.

              In atlantis mode it is the number of sharks.

              In atunnels mode it is means nothing.

              In ball mode it is the number of balls.

              In bat mode it is the number of  bats,  could  be  less
              because of conflicts.

              In blot mode this refers to the number of  pixels  ren-
              dered in the same color.

              In bouboule mode it is the number of stars.

              In bounce mode it is the number of balls, could be less
              because of conflicts.

              In braid mode it is the upper bound number of strands.

              In bubble mode it is the number of bubbles.

              In bubble3d mode it is the number of bubbles.

              In bug mode it is the number of  bugs,  could  be  less
              because of conflicts.

              In cage mode it is means nothing.

              In clock mode it is the percentage of the  screen,  but
              less than 100%.

              In coral mode it is the number of seeds.

              In crystal mode it is the number of polygons.

              In daisy mode it is the  number  flowers  that  make  a
              meadow.

              In dclock mode it means nothing.

              In deco mode it is the depth.

              In demon mode this refers the number of colors.

              In dilemma mode  this  refers  the  number  of  initial
              defectors.
              In discrete mode it is the number of points.

              In drift mode it is the number  of  levels  to  recurse
              (larger = more complex).

              In dragon mode it means nothing.

              In euler2d mode it is the number of segments.

              In eyes mode it is the number of eyes.

              In fadeplot mode it is the number of steps.

              In fiberlamp it is the number of fibers.

              In fire mode it is the number of fire particles (set it
              to 0 to have rain).

              In flag mode it means nothing.

              In flame mode it is the number  of  levels  to  recurse
              (larger = more complex).

              In flow mode it is the number of bees.

              In forest mode it is  the  number  trees  that  make  a
              forest.

              In galaxy mode it means the number of galaxies.

              In gears mode it is the number of degrees to rotate the
              set of gears by.

              In glplanet mode it is the number of hundredth  degrees
              to roll the planet by.

              In goop mode it is the number of blobs per plane.

              In grav mode it is the number of planets.

              In helix mode it means nothing.

              In hop mode this refers to the number  of  pixels  ren-
              dered in the same color.

              In hyper mode it the number of dimensions.

              In ico mode it is the ith platonic solid.

              In ifs mode it means nothing.

              In image mode it means it is the  number  of  logos  on
              screen at once.

              In juggle mode it is time  in  milliseconds  between  a
              throw and the next catch.

              In julia mode it is the depth of recursion.

              In kaleid mode it is the number of pens.

              In kumppa mode it means nothing.

              In lament mode it means nothing.

              In laser mode it is the number lasers.

              In life and life3d modes it is the  number  of  genera-
              tions before a glider is introduced.

              In life1d mode it means nothing.

              In lisa mode it is the number of loops.

              In lissie mode it is the number of worms.

              In loop mode it is the number of flaws.

              In mandelbrot mode it is the order.

              In marquee mode it means nothing.

              In matrix mode it means nothing.

              In maze mode it means nothing.

              In moebius mode it is means nothing.

              In molecule mode it means nothing.

              In morph3d mode it is the ith platonic solid.

              In mountain mode it is the number of mountains.

              In munch mode it means nothing.

              In noof mode it means nothing.

              In nose mode it means nothing.

              In qix mode it is the number of points.

              In pacman mode it means the number of ghosts.

              In penrose mode it means nothing.

              In petal mode it the greatest random number of petals.

              In petri mode it means nothing.

              In pipes mode it shows different joints,  0  random,  1
              spherical, 2 bolted elbow, 3 elbow, and 4 alternating.

              In polyominoes mode it means nothing.

              In puzzle mode it the number of moves.

              In pyro mode it is the maximum number flying rockets at
              one time.

              In roll mode it is the number of points.

              In rotor mode it is the number of rotor  thingys  which
              whirr...

              In rubik mode it is the number of moves.

              In sballs mode it is the number of spheres.

              In scooter mode it is the number of doors.

              In shape mode it means nothing.

              In sierpinski mode it is the number of points.

              In slip mode it means nothing.

              In solitare mode it means nothing.

              In space mode it is the number of stars.

              In sphere mode it means nothing.

              In spiral mode it is the number of spirals.

              In spline mode it is the number of points "splined".

              In sproingies mode it is the number of sproingies.

              In stairs mode it is means nothing.

              In star mode it is the number of stars on the screen at
              once.

              In starfish mode it means nothing.

              In strange mode it means nothing.

              In superquadrics mode its the number of horizontal  and
              vertical lines in the superquadric.

              In swirl mode it means the number of "knots".

              In swarm mode it is the number of bees.

              In t3d mode it means nothing.

              In tetris mode it means nothing.

              In text3d mode it means nothing.

              In thornbird mode it is the number of points.

              In triangular mode it is the number of mountains.

              In tube mode it is a rectangle (= 1), an ellipse (= 2),
              or a polygon if greater.

              In turtle mode it means nothing.

              In vines mode it is draw a complete vine  (=  0)  or  a
              portion (= 1).

              In voters mode it means the number of parties, 2 or 3.

              In wator mode it means the breed time for the fish.

              In wire mode it means the length of the circuit.

              In world mode it is the number of worlds.

              In worm mode it is the number of worms.

              In xcl mode it represents the number of planes.

              In xjack mode it means nothing.

              In blank mode it means nothing.

              In bomb mode it means the number of minutes to  autolo-
              gout.

              A negative count allows for randomness.  The range from
              the  minimum allowed nonnegative count for a particular
              mode to the ABS( count ) (or maximum  allowed  count  ,
              whichever is less).

         -batchcount num
              The batchcount option is deprecated  but  should  still
              work as count.

         -cycles num
              The cycles option sets the number of cycles until  time
              out  for  ant,  ant3d,  apollonian,  blot,  braid, bug,
              clock, crystal, daisy, deco, demon, dilemma,  discrete,
              dragon,  eyes,  fiberlamp,  flag, flow, forest, galaxy,
              helix, hop, hyper, ico, juggle,  laser,  life,  life1d,
              life3d,   lisa,  lissie,  loop,  mandelbrot,  mountain,
              petal, sierpinski, shape, spline  +erase,  t3d,  thorn-
              bird,  triangle,  tube,  voters,  wator, and wire.  For
              euler2d and worm it is the length  of  the  lines,  for
              atlantis it is the shark speed, for fadeplot, julia and
              spiral it is the length of the trail of dots, munch  it
              is  the  minimum  size of the squares, for kaleid it is
              the % of black, for qix it is the number of lines,  for
              spline  -erase it means the number of splines * 64 (for
              compatibility with +erase), for gears it is the  number
              of  degrees  to increment the spin of each gear by, for
              glplanet it is  the  number  of  hundredth  degrees  to
              rotate  the  planet  by, for molecule it is the time in
              seconds until timeout, for pipes it is  the  number  of
              systems  to  draw before clearing the screen, for rubik
              it is the number of steps to complete a  90  move,  for
              sballs  it is the sphere speed value, for scooter it is
              the speed, for superquadrics it is the number of frames
              it  takes  to  morph  from  one  shape to another.  for
              text3d it is the number of times drawing a word  before
              the next one, For others it means nothing.

         -size num
              The size option sets the size maximum size of a star in
              bouboule,  pyro  and  star,  size  of  ball in ball and
              bounce, size of bat in bat, maximum size of  bubble  in
              bubble, size of clock in clock, minimum size of rectan-
              gles in deco, size of the polygons in crystal, tik_tak,
              and  toneclock, size of polyhedron in ico, size of lis-
              sie in lissie, size of dots of flag, for kaleid  it  is
              the  symmetry,  width  of maze hallway, size of side of
              penrose tile, radius of loop in lisa, radius of ball in
              roll,  number of corners in sierpinski, number of stars
              in scooter, size of tube in  tube,  width  of  worm  in
              worm,  line  width in rotor, size of cells in ant, bug,
              dilemma, dragon, life, life1d, pacman,  petri,  tetris,
              voters,  wator,  and  wire.  In pipes it is the maximum
              length of a system.  In flow and swarm it is the length
              of  the  lines.   In  atlantis it is the shark size.  A
              negative  number  allows  for  randomness,  similar  to
              count.  In atunnels, fire, gears, sballs and sproingies
              it is the size of the screen  (default  400),  this  is
              because  on many slow systems it runs too slow when the
              picture covers the full screen.   Set  to  0  for  full
              screen on fast machines.

         -ncolors num
              The ncolors option sets the maximum number of colors to
              be used.

         -saturation value
              The saturation option sets saturation of the color ramp
              used  to  value  .  0  is  grayscale and 1 is very rich
              color.  0.4 is a nice pastel.

         -erasemode modename
              As of this writing there are over 12 erase  modes  sup-
              ported  (if  its  not  chosen its assumed random).  The
              erase modes are random_lines, random_squares, venetian,
              triple_wipe, quad_wipe, circle_wipe, three_circle_wipe,
              squaretate,  fizzle,   spiral,   slide_lines,   losira,
              no_fade.   modename is now similar to the option model-
              ist where you can it can be something like "all-losira"
              to  get  all erasemodes but losira.  Use a "+" or a ","
              to add modes like "spiral+venetian".

         -erasedelay usecs
              The erasedelay option sets the number  of  microseconds
              for  steps  of  the  erasemode  (a setting of 0 and the
              erasemode is bypassed).

         +/-nolock
              The nolock option causes xlock to only  draw  the  pat-
              terns and not lock the display.  A key press or a mouse
              click will terminate the screen saver.

         -/+inwindow
              Runs xlock in a window, so that you can iconify,  move,
              or resize it and still use your screen for other stuff.
              When running in a window, xlock no  longer  locks  your
              screen, it just looks good.

         -/+inroot
              Runs xlock in your  root  window.   Like  the  inwindow
              option  it  no  longer  locks the screen, it just looks
              good.

         -/+remote
              The remote option tells xlock  to  not  stop  you  from
              locking remote X11 servers.  This option should be used
              with care and is intended mainly to lock X11  terminals
              which  cannot  run  xlock locally.  If you lock someone
              else's workstation, they will have to know  your  pass-
              word   to  unlock  it.   Using  +remote  overrides  any
              resource derived values for remote and  prevents  xlock
              from  being  used  to lock other X11 servers.  (Use `+'
              instead of `-' to override resources for other  options
              that can take the `+' modifier similarly.)

         -/+mono
              The mono option causes  xlock  to  display  monochrome,
              (black  and  white)  pixels  rather  than  the  default
              colored ones on color displays.

         -/+allowaccess
              This option is required for servers which do not  allow
              clients  to modify the host access control list.  It is
              also useful if you need to run x clients  on  a  server
              which is locked for some reason...  When allowaccess is
              true, the X11 server is left open for clients to attach
              and  thus  lowers  the  inherent  security of this lock
              screen.  A side effect of using this option is that  if
              xlock  is  killed -KILL, the access control list is not
              lost.

         -vtlock modename
              This option is used on a XFree86 system  to  manage  VT
              switching in [off|noswitch|switch|restore] mode.

         off       means no VT switch locking.

         switch    means VT switch locking + switching  to  xlock  VT
                   when activated.

         restore   means VT switch locking + switching  to  xlock  VT
                   when  activated  +  switching  back to previous VT
                   when desactivated.

         noswitch  means VT switch locking  only  when  xlock  VT  is
                   active.

         -/+allowroot
              The allowroot option allows the root password to unlock
              the  server as well as the user who started xlock.  May
              not be able to turn this on and off depending  on  your
              system and how xlock was configured.

         -/+debug
              Allows xlock to be debugged by doing  all  but  locking
              the screen.

         -/+description
              The  description  option  causes  xlock  shows  a  mode
              description  above  password window.  The default is to
              show this description.

         -/+echokeys
              The echokeys option causes xlock to echo '?' characters
              (default)  for each key typed into the password prompt.
              Some consider this a security risk, so the  default  is
              to not echo anything.

         -echokey echokey
              The text character to use for echo key in echokeys .

         -/+enablesaver
              By default xlock will disable  the  normal  X  server's
              screen  saver  since  it is in effect a replacement for
              it.  Since it is possible to set delay parameters  long
              enough  to  cause  phosphor burn on some displays, this
              option will turn back on the default screen saver which
              is very careful to keep most of the screen black.

         -/+resetsaver
              By default xlock will call XResetScreenSaver.  This may
              be undesirable with DPMS monitors.

         -/+grabmouse
              The grabmouse option causes xlock to grab the mouse and
              keyboard,  this is the default.  xlock can not lock the
              screen without this.

         -/+grabserver
              The grabserver option causes xlock to grab the  server.
              This  is not usually needed but some unsecure X servers
              can be defeated without this.

         -/+install
              Allows xlock to install its own colormap if xlock  runs
              out  of  colors.   May  not  work  on  with some window
              managers (fvwm) and does  not  work  with  the  -inroot
              option.

         -/+mousemotion
              Allows you to turn on and off the  sensitivity  to  the
              mouse to bring up the password window.

         -/+sound
              Allows you to turn on and off sound if  installed  with
              the capability.

         -/+timeelapsed
              Allows you to find out how long a machine is locked  so
              you  can  complain  to an administrator that someone is
              hogging a machine.

         -/+usefirst
              The usefirst option causes xlock to use  the  keystroke
              which  got  you  to  the  password  screen as the first
              character in the password.  The default  is  to  ignore
              the first key pressed.

         -/+verbose
              Verbose mode, tells what options it is going to use.

         -nice nicelevel
              The nice option sets system nicelevel of the xlock pro-
              cess to nicelevel .

         -lockdelay seconds
              The lockdelay option sets the number of seconds  before
              the  screen  needs a password to be unlocked.  Good for
              use with an autolocking mechanism like xautolock(1).

         -timeout seconds
              The timeout option sets the number  of  seconds  before
              the password screen will time out.

         -font fontname
              The font option sets the font to be used on the  prompt
              screen.

         -planfont fontname
              option sets the font to be used for the  text  that  is
              displayed in the lower part of the password screen.

         -fg color
              The fg option sets the color of the text on  the  pass-
              word screen to color .

         -bg color
              The bg option sets the color of the background  on  the
              password screen to color .

         -foreground color
              The foreground option sets the color of the text on the
              password screen to color .

         -background color
              The background option sets the color of the  background
              on the password screen to color .

         -username string
              Text string is shown in front of user name, defaults to
              "Name: ".

         -password string
              Text string is the password prompt string, defaults  to
              "Password: ".

         -info string
              Text string is an informational  message  to  tell  the
              user what to do, defaults to "Enter password to unlock;
              select icon to lock.".

         -validate string
              Text string is a message  shown  while  validating  the
              password, defaults to "Validating login..."

         -invalid string
              Text  string  is  a  message  shown  when  password  is
              invalid, defaults to "Invalid login."

         -geometry geom
              The geometry option sets geom the size  and  offset  of
              the  lock  window  (normally  the  entire screen).  The
              entire screen format is still  used  for  entering  the
              password.  The purpose is to see the screen even though
              it is locked.  This should be used with  caution  since
              many of the modes will fail if the windows are far from
              square or are too small  (size  must  be  greater  than
              0x0).   This  should  also be used with -enablesaver to
              protect screen from phosphor burn.

         -icongeometry geom
              The icongeometry option  sets  geom  the  size  of  the
              iconic  screen  (normally 64x64) seen when entering the
              password.  This should be used with caution since  many
              of  the  modes  will  fail  if the windows are far from
              square or are too small  (size  must  be  greater  than
              0x0).   The  greatest size is 256x256.  There should be
              some limit so  users  could  see  who  has  locked  the
              screen.  Position information of icon is ignored.

         -glgeometry geom
              The glgeometry option sets geom the size of the  screen
              for gl modes.  Not normally available or needed.

         -/+wireframe
              Turn on/off wireframe, available  on  ant3d,  atlantis,
              atunnels, daisy, fire, gears, lament, life3d, mountain,
              sballs, sproingies, superquadrics, and triangle.

         -/+showfps
              Turn  on/off  frame  per  sec  display,  available   on
              atlantis,   atunnels,   bubble3d,  cage,  fire,  gears,
              invert,  lament,  moebius,  morph3d,   rubik,   sballs,
              stairs, and superquadrics.

         -/+fpstop
              Turn on/off frame per sec display  on  top  of  screen,
              used if showfps is on.

         -fpsfont fontname
              The fpsfont option sets the font  to  be  used  in  the
              frame per sec display, used if showfps is on.

         -/+use3d
              Turn on/off 3d view, available on bouboule, pyro, star,
              and worm.

         -delta3d value
              Space between the center of your 2 eyes for 3d mode.

         -none3d color
              Color used for empty size in 3d mode.

         -right3d color
              Color used for right eye in 3d mode.

         -left3d color
              Color used for left eye in 3d mode.

         -both3d color
              Color used for overlapping images for  left  and  right
              eye in 3d mode.

         -program programname
              The program option sets the program to be used  as  the
              fortune generator.  Currently used only for marquee and
              nose modes.

         -messagesfile formatted-filename
              The messagesfile option sets the file to be used as the
              fortune  generator.   The  first entry is the number of
              fortunes, the next line  contains  the  first  fortune.
              Fortunes  begin  with  a  "%%"  on  a  line  by itself.
              Currently used only for marquee and nose modes.  If one
              exists, it takes precedence over the fortune program.

         -messagefile filename
              The messagefile option sets the file whose contents are
              displayed.   Currently  used  only for marquee and nose
              modes.  If one exists, it  takes  precedence  over  the
              fortune program and messagesfile.

         -message textstring
              The message option sets the text to be displayed  in  a
              mode.   Currently  used only for flag, marquee and nose
              modes.  If one exists, it  takes  precedence  over  the
              fortune program, messagesfile and message.

         -messagefont fontname
              The messagefont option sets the font to be used in  the
              mode.   Currently used only for flag, marquee, and nose
              modes.

         -bitmap filename
              The bitmap option sets the xbm, xpm, or ras file to  be
              displayed with flag, image, life, life1d, maze, or puz-
              zle mode.  For eyes and  pacman  only  a  xbm  file  is
              accepted.   Certain modes reject the bitmap if too big.
              /

## MORE OPTIONS (these may not be available)

         -cpasswd crypted-password
              The cpasswd option sets the key to be this text  string
              to unlock xlock instead of password file.

         -forceLogout minutes
              The forceLogout option sets minutes to auto-logout.

         -logoutButton minutes
              The logoutButton option sets minutes to logoutButton is
              available on password screen.

         -logoutButtonLabel string
              Text string is a message  shown  inside  logout  button
              when logout button is displayed.  Defaults to "Logout".

         -logoutButtonHelp string
              Text string is a message shown  outside  logout  button
              when  logout  button  is displayed.  Defaults to "Click
              the \"Logout\" button to log  out  current\n  user  and
              make workstation available."

         -logoutFailedString string
              Text string  is  a  message  shown  when  a  logout  is
              attempted  and  fails.   Defaults  to  "Logout  attempt
              FAILED.\n  Current  user  could  not  be  automatically
              logged out."

         -/+dtsaver
              Turn on/off CDE Saver Mode.  This option is only avail-
              able if CDE support was compiled in.

         -modulepath path
              The modulepath option sets the directories  that  xlock
              searches  for  mode  modules  to  load.   It is a colon
              separated list of directories to  search.  If  "%S"  is
              included  in  the  path,  it is replaced by the default
              modulepath.  To add a private module directory  to  the
              default  path, use something like '%S:~/mymoduledir' as
              the path.  This option is only available if module sup-
              port was compiled in.

         -locksound string
              Text string references  sound  to  use  at  lock  time.
              Default  sound,  male  voice:   "Thank  you,  for  your
              cooperation."

         -infosound string
              Text string references sound to  use  for  information.
              Default sound, male voice:  "Identify please."

         -validsound string
              Text string references sound  to  when  a  password  is
              valid.  Default sound, female voice:  "Complete."

         -invalidsound string
              Text string references sound  to  when  a  password  is
              invalid.   Default  sound, female voice: "I am not pro-
              grammed to give you that information."

         -startCmd string
              Text string command  to  execute  when  the  screen  is
              locked.  Commonly  used instructions include:  "zaway".
              This command, if still  running  when  the  screensaver
              exits, will be killed.

         -endCmd string
              Text string command  to  execute  when  the  screen  is
              unlocked.

         -pipepassCmd string
              Text string command into which  to  pipe  the  password
              when the screen is unlocked.

         -logoutCmd string
              Text string command to execute when  the  program  logs
              the  user out (either via the autologout or by pressing
              the logout button).

         -mailCmd string
              Text string command to  execute  when  the  program  to
              check mail.

         -mailIcon string
              Text string of file for the "mail arrived" bitmap.

         -nomailIcon string
              Text string of file for the "no mail" bitmap.

         -dpmsstandby  seconds
              Allows one to  set  DPMS  Standby  for  monitor  (0  is
              defined  as  infinite).   (Horizontal sync on, Vertical
              sync off, RGB guns off, power supply on, tube filaments
              energized,   (screen  saver  mode).   Typical  17  inch
              screen...  110 out of 120 watts with a 3  sec  recovery
              time.)   This  option is only available if DPMS support
              was compiled in.

         -dpmssuspend  seconds
              Allows one to  set  DPMS  Suspend  for  monitor  (0  is
              defined  as  infinite).  (Horizontal sync off, Vertical
              sync on, RGB guns off, power supply off, tube filaments
              energized.   Typical  17 inch screen ...  15 out of 120
              watts with a 3 sec recovery time.)  This option is only
              available if DPMS support was compiled in.

         -dpmsoff  seconds
              Allows one to set DPMS Power  Off  for  monitor  (0  is
              defined  as  infinite).  (Horizontal sync off, Vertical
              sync off, Small auxiliary circuit stays on  to  monitor
              the HS/VS signals to enable power on when data needs to
              be displayed on the screen.  Typical 17 inch screen ...
              5  out of 120 watts with a 10 sec recovery time.)  This
              option is only available if DPMS support  was  compiled
              in.

## SPECIAL MODE DEPENDENT OPTIONS

         -neighbors num
              The neighbors option sets the number of neighbors of  a
              cell  to  3,  4,  6,  9 (may not have real mathematical
              meaning), or 12 for several automata modes  (ant,  bug,
              demon,  dilemma, life, loop, and wire) (bug and loop do
              not span this full range).  Setting it to  0  typically
              randomizes   this,   except   where  bitmaps  are  used
              (dilemma, life, voters, and wator).

         -/+eyes
              Turn on and off eyes for ant, ant3d, and bug.

         -/+cycle
              Turn on and off colour cycling  in  crystal,  lyapunov,
              mandelbrot, starfish, swirl, tetris, and tube.

         -/+label
              Turn on and off alternate space and number labeling  in
              apollonian. For ant and ant3d this turns on and off the
              labeling of the rule.  For life and life3d  this  turns
              on and off the labeling of the pattern name and rule.

         -/+serial
              Turn on and off  sequential  allocation  of  colors  in
              kaleid.  For  life and life3d this turns on and off the
              picking of sequential patterns (to be used with  middle
              button of the mouse).

         -/+trackmouse
              Turn on and off mouse interaction in eyes, fire, julia,
              solitare,  sballs, swarm, and tetris. For maze, pacman,
              solitare and tetris this may not be available depending
              on how xlock was configured.

         -/+texture
              Turn on and off texturing in fire, lament  and  sballs.
              This  may  not  be available depending on how xlock was
              configured.

         -rule <rule>
              The      rule      string      is      defined       as
              S<neighborhood>/B<neighborhood>  for  life  and life3d.
              Special parameters: P, picks a  random  rule  from  all
              rules  that have known patterns; G, picks a random rule
              from all rules that have known  gliders.   For  life  a
              good  example is Conway's rule which is S23/B3.  Others
              are B36/S23 and B3678/S34678.  For life3d good examples
              are  Bay's rules which are S45/B5, S567/B6, S56/B5, and
              S67/B67.  The rule string is defined as a binary string
              (requires  at least one 1 and one 0) for ant and a base
              4 (or quadranary) string (requires 3 of 4 digits to  be
              represented) for ant3d. Here a special parameter, T and
              then a number, will pick a specific table.

         -lifefile filename
              The lifefile option sets the life and life3d  lifeform.
              Only  one format is currently supported, similar to the
              #P xlife format.  For life3d, 2 linefeeds in a row  are
              assumed to advance the depth.

         -/+truchet
              Turn on and off Truchet lines (trail) in ant.

         -/+altgeom
              Turn on and off  alternate  geometries  (off  euclidean
              space,  on  includes spherical and hyperbolic) in apol-
              lonian mode.

         -whalespeed num
              Allows one to set the speed of the whales  and  dolphin
              in atlantis.

         -/+boil
              Turn on and off having the bubbles bubble up in bubble.

         -nx num
              Allows one to set  the  number  of  unit  cells  in  x-
              direction in crystal.

         -ny num
              Allows one to set  the  number  of  unit  cells  in  y-
              direction in crystal.

         -/+centre
              Turn on and off the centering on screen in crystal.

         -/+maxsize
              Turn on and off the centering on screen in crystal.

         -/+cell
              Turn on and off the drawing of unit cell in crystal.

         -/+grid
              Turn on and off the drwing of grid of  unit  cells  (if
              -cell is on) in crystal.

         -/+garden
              Turn off and on garden look in daisy.

         -/+popex
              Turn on and off the  population  explosion  counter  in
              dclock.

         -/+forest
              Turn on and off the tropical deforest  (hectares/acres)
              counter in dclock.

         -/+hiv
              Turn on and off the HIV infection counter in dclock.

         -/+lab
              Turn on and off the Animal Research counter in dclock.

         -/+veg
              Turn on and  off  the  Animal  Consumation  counter  in
              dclock.

         -/+y2k
              Turn on and off the Year 2000 countdown in dclock.

         -/+millennium
              Turn on and off the Second Millennium (January 1, 2001)
              countdown in dclock.

         -bonus value
              Allows one to set the bonus for cheating... between 1.0
              and 4.0 in dilemma.

         -/+conscious
              Turn off and on self-awareness in dilemma.

         -/+grow
              Turn  on  and  off  growing  fractals  (else  they  are
              animated) for drift.

         -/+liss
              Turn on and off using lissajous figures to  get  points
              for drift.

         -/+fog
              Turn on and off fog for fire.

         -/+shadows
              Turn on and off shadows for fire.

         -trees num
              Validate the displaying of trees for  fire  if  greater
              than zero.

         -/+invert
              Turn on and off inverting of the flag.

         -/+rotate
              Turn on/off rotating around attractor in flow.

         -/+ride
              Turn on/off rideing in the flow.

         -/+box
              Turn on/off bounding box in flow.

         -/+periodic
              Turn on/off periodic attractors in flow.

         -/+search
              Turn on/off search for new attractors in flow.

         -/+dbuf
              Turn on/off double buffering in flow.

         -/+tracks
              Turn on and off star tracks in galaxy.

         -/+light
              Turn on and off lighting of the planet for glplanet.

         -/+bounce
              Turn on and off bouncing movement  of  the  planet  for
              glplanet.

         -pimage filename
              Use the named xbm or xpm file for texturing the  planet
              for  glplanet.  Use BUILTIN as filename for the builtin
              image taken from Xearth.

         -/+roll
              Turn on and off rolling of the planet for glplanet.

         -/+rotate
              Turn on and off rotation of the planet for glplanet.

         -/+texture
              Turn on and off texturing of the planet for glplanet.

         -/+stars
              Turn on and off showing stars  in  the  background  for
              glplanet.

         -/+decay
              Turn on and off decaying orbits for grav.

         -/+trail
              Turn on and off decaying trail of dots for grav.

         -/+ellipse
              Turn on and off ellipse format in helix.

         -/+martin
              Turn on and off  Barry  Martin's  square  root  hop.  -
              /+popcorn  Turn  on and off Clifford A. Pickover's pop-
              corn hop.

         -/+ejk1...ejk6
              Turn on and off Ed J. Kubaitis' hops.

         -/+rr
              Turn on and off Renaldo Recuerdo's hop.

         -/+jong
              Turn on and off Jong's hop.

         -/+sine
              Turn on and off Barry Martin's sine hop.

         -pattern <pattern>
              Allows one to set the pattern for juggle.

         -tail num
              Minimum Trail Length for juggle.

         -/+real
              Turn on/off real-time juggling for juggle.  Deprecated.
              There should be no need to turn off real-time juggling,
              even on slow systems.  Adjust speed using -count.

         -/+describe
              Turn on/off pattern descriptions in juggle.

         -/+balls
              Turn on/off Balls in juggle.

         -/+clubs
              Turn on/off Clubs in juggle.

         -/+torches
              Turn on/off Flaming Torches in juggle.

         -/+knives
              Turn on/off Knives in juggle.

         -/+rings
              Turn on/off Rings in juggle.

         -/+bballs
              Turn on/off Bowling Balls in juggle.

         -/+planetary
              Turn on and off planetary gears in gears.

         -planetsize num
              Sets the size of the screen  for  planetary  option  in
              gears.  This is for machines with slower CPU. (Set to 0
              for full screen).

         -/+disconnected
              Turn on and off disconnected pen movement in kaleid.

         -/+alternate
              Turn on and off alternate rotated display mode kaleid.

         -/+quad
              Turn on and off quad mirrored/rotated mode  similar  to
              size 4 in kaleid.

         -/+oct
              Turn on and off oct mirrored/rotated  mode  similar  to
              size 8 in kaleid.

         -/+linear
              Turn on and  off  Cartesian/Polar  coordinate  mode  in
              kaleid.

         -/+conway
              Turn on and off John Conway's original Life rule S23/B3
              life.

         -/+highlife
              Turn on and off  David  Bell's  HighLife  rule  S23/B36
              life.

         -/+daynight
              Turn on and off Nathan Thompson's Day  and  Night  rule
              S34678/B3678 life.

         -/+callahan
              Turn on and off  Paul  Callahan's  S2b34/B2a  hexagonal
              life.

         -/+andreen
              Turn on and off Bob Andreen's S2a2b4a/B2a3a4b hexagonal
              life.

         -/+trilife
              Turn on and off Carter Bays' S34/B45 triangular life.

         -/+trilife1
              Turn on and off Carter Bays' S45/B456 triangular life.

         -/+trilife2
              Turn on and off Carter Bays' S23/B45 triangular life.

         -/+totalistic
              Turn on and off totalistic rules for life1d. If this is
              off  then  it  follows  rules  of  the LCAU collection.
              These rules may not be symmetric and are more general.

         -/+additive
              Turn on and off additive functions mode in lisa.

         -/+dissolve
              Turn on and off disolving state in loop.

         -/+evolve
              Turn on and off Evolving Loops in loop.

         -/+langton
              Turn on and off Langton Loops for loop.

         -/+sheath
              Turn on and off sheath extension for loop.

         -/+wrap
              Turn on and off wrapping of borders for loop.

         -increment num
              Sets the option for increasing orders in mandelbrot.

         -/+binary
              Turn on and off binary decomposition  color  modulation
              in mandelbrot.

         -/+dem
              Turn on and off Distance Estimator Method  (instead  of
              escape  time)  in  mandelbrot.  -/+pow  Turn on and off
              adding z^z in mandelbrot.

         -/+sin
              Turn on and off adding sin(z) in mandelbrot.

         -/+noants
              Turn off and on ants in moebius.

         -/+solidmoebius
              Turn on and off solid Mobius strip in moebius.

         -/+atoms
              Turn on and off the drawing of spheres for the atoms in
              molecule.

         -/+bbox
              Turn on and off showing the molecules in a blue box  in
              molecule.

         -/+bonds
              Turn on and off the drawing  of  the  atomic  bonds  in
              molecule.

         -molecule filename
              Read a molecule structure from a pdb file in molecule.

         -/+labels
              Turn on and off the labeling of the atoms in molecule.

         -spin{x|y|z}
              Set the axis for molecule  rotation  in  molecule.  The
              default is "XYZ".

         +spin
              Turn off the molecule rotation in molecule.

         -/+titles
              Turn on and off the molecule description in molecule.

         -/+wander
              Turn on and off the moving of the molecule on a  sinoid
              curve in molecule. Turn on and off movements in fire.

         -/+ammann
              Turn on and off lines for penrose.

         -increment value
              Allows fine adjustments to order in mandelbrot.

         -/+erase
              Turn on and off erasing for spline. If this  option  is
              on,  cycles  is  divided by 64 to compute the number of
              lines, so as to be compatible when using -fullrandom.

         -factory num
              Number of extra factory parts in pipes.

         -/+fisheye
              Turn on if you want a zoomed-in view of pipes.

         -/+tightturns
              Turn on if you want the pipes to bend more often.

         -/+rotatepipes
              Turn on if you want the pipe system rotated in pipes.

         -/+complete
              Turn on or off complete graph morphing in qix.

         -size[xyz] num
              Number represents the number of cubies on the x, y,  or
              z  axis.   Negative  numbers offer randomness from 2 to
              the absolute value of the number.  star.

         -/+hideshuffling
              Turn on or off hidden shuffle phase for rubik.

         -/+border
              Turn on or off borders in shape.

         -/+shadowing
              Turn on or off shadowing in shape.

         -/+stippling
              Turn on or off stippling in shape.

         -intensity value
              Set the brightness (default  2185)  of  the  sierpinski
              structure for sierpinski3d.

         -maxdepth value
              Set the maximum depth (up  to  10)  of  the  sierpinski
              structure for sierpinski3d.

         -speed value
              Determines after how much steps the depth  changes  for
              sierpinski3d.

         -trek num
              If its a high number you will see the  space  ship  all
              the time in star.

         -/+rock
              Turn on and off rocks for star. If this is  off,  stars
              will be seen instead.

         -/+straight
              Turn on if star gets you motion sick.

         -cyclepeed num
              Set speed of cycling in starfish.

         -rotation num
              Set rotation velocity in starfish.

         -thickness num
              Set thickness in starfish.

         -/+rock
              Turn on and off blob for starfish.

         -spinspeed num
              Set speed of rotation, in degrees per frame for  super-
              quadrics.

         -/+bonus
              Turn on in tetris to see 5 square bonus pieces.

         -/+well
              Turn on in tetris to see welltris.

         -ttfont filename
              Sets the True Type font file (or font  directory)  used
              for text3d

         -extrusion num
              Sets length of the text extrusion for text3d

         -rot_amplitude float
              Sets rotation amplitude value of each letter for text3d

         -rot_frequency float
              Sets rotation frequency for text3d

         -/+no_split
              Turn on and off word splitting for text3d

         -ttanimate function_name
              Sets the animation function used for text3d.  Currently
              one  of  :  Random  FullRandom  Default  Default2  None
               Crazy  UpDown  Extrude  RotateXY  RotateYZ   Frequency
               Amplitude

         -speed km/h
              The speed for all planes in km/h for xcl.

         -frametime microseconds
              The time for one frame on the screen. This time is used
              to calculate the delay time and depends on the speed of
              the X server for xcl.

         -line_length mm
              The distance between the pilot and the plane for xcl.

         -spectator mm
              The distance between spectator and pilot. It should  be
              grater  than the line_length and the half wing width of
              the plane to be not dangerous  for  the  spectator  for
              xcl.

         -viewmodel
              Shows an animated view of one model for xcl.

         -/+oldcolor
              Sets the colors for the first two planes fixed  to  red
              and yellow in xcl.

         -xcldebug
              Shows some additional timing information to  make  sure
              that the calibrate procedure goes right in xcl.

         -automatic
                 The auto scale for automatic fit into the window  is
                 Deactivated with this option for xcl.

         -randomstart
              Use a random start point for models at startup for xcl.

         -preset  num
              Use the preset num [1-5] for biof.

         -lines  num
              Use num lines in biof.

         -points  num
              Use num points in biof.

         -/+offangle
              Use offangle in biof.

         -duration seconds
              Allows one to set a duration  for  a  mode  in  random.
              Duration of 0 is defined as infinite.

         -/+fullrandom
              Turn on/off randomness options within modes in  random.
              Not implemented for all mode options.

         -modelist textstring
              Allows one to pass a list of files to randomly  display
              to random. "all" will get all files but blank (and bomb
              if  compiled  in).  "all,blank"  will  get  all  modes.
              "all,-image bounce,+blank" will get all modes excluding
              image and bounce modes.  "bug wator" will get only  bug
              and  wator.  "allgl" will get only the GL modes if com-
              piled in, all-allgl  will  get  all  excluding  the  GL
              modes, "allnice" will weed out high cpu usage modes (as
              well as hackers and gl modes).  "allxpm" will  get  all
              modes that use xpm.  "allwrite" will get all modes that
              take advantage of  writable  colormaps  (not  including
              xpm).  "all3d" will get all the modes that support this
              option.  "allmouse" will get all the modes that support
              mouse  interaction.  Similarly, "allautomata" for auto-
              mata   modes,   "allfractal"   for    fractal    modes,
              "allgeometry"  for geometry modes, "allspace" for space
              modes.  The random mode itself can not be referenced.

         -/+sequential
              Turn on non-random random option.

## **WARNING**

         xlock can appear to hang if it is  competing  with  a  high-
         priority  process  for  the  CPU.  For  example, if xlock is
         started after a process with  'nice  -20'  (high  priority),
         xlock will take  considerable amount of time to respond.

## SHADOW PASSWORDS

         If the machine is using a shadow password system, then xlock
         may  not  be  set up to get the real password and so must be
         given one of its own. This can  be  either  on  the  command
         line,   via   the   -cpasswd   option,   or   in   the  file
         $HOME/.xlockrc, with the first taking precedence.   In  both
         cases  an  encrypted  password is expected (see makekey(8)).
         If neither is given, then xlock will prompt for  a  password
         and  will  use that, also storing an encrypted version of it
         in $HOME/.xlockrc for future use.

## XLOCK AND SSH-AGENT

         If you use ssh-agent(1) to avoid entering a passphrase every
         time  you  use  one  of  your ssh(1) private keys, it's good
         security practice to have ssh-agent forget the  keys  before
         you  leave  your terminal unattended.  That way, an attacker
         who takes over your terminal  won't  be  able  to  use  your
         private  ssh  keys  to  log  in  to other systems.  Once you
         return to your terminal, you can enter  the  passphrase  and
         re-add the keys to ssh-agent.  There are a couple of ways in
         which xlock can help to automate this process.  Firstly, the
         startCmd  option  allows xlock to be configured to run 'ssh-
         add -D' every time you lock the screen, so  that  your  keys
         are automatically deleted from ssh-agent.  If the passphrase
         on your ssh keys is the same as your  password,  then  xlock
         can  also  be  made to re-add the keys to ssh-agent when you
         unlock  the  screen,  via  the  pipepassCmd  option.    This
         requires  a  bit of scripting, as the command must read your
         password from standard input and then automate the  interac-
         tion  with  ssh-add to re-add the keys.  There is an example
         of  such  a  script  in  the  xlock   distribution   -   see
         etc/xlockssh*

## BUGS

         "kill -KILL xlock " causes the server that was locked to  be
         unusable, since all hosts (including localhost) were removed
         from the access control list to lock out new X clients,  and
         since  xlock  could  not catch SIGKILL, it terminated before
         restoring the access control list.  This will  leave  the  X
         server  in  a state where "you can no longer connect to that
         server, and this operation cannot  be  reversed  unless  you
         reset  the server."            -From the X11R4 Xlib Documen-
         tation, Chapter 7.
         NCD terminals do not allow xlock to  remove  all  the  hosts
         from  the  access  control list.  Therefore you will need to
         use the "-remote" and "-allowaccess" switches.  If you  hap-
         pen  to run without "-allowaccess" on an NCD terminal, xlock
         will not work and you will need to reboot the  terminal,  or
         simply  go into the SETUP menus, under 'Network Parameters',
         and turn off TCP/IP access control.

## SEE ALSO

         X(1), Xlib Documentation.

## AUTHOR

         Maintained by:
              David Albert Bagley, <bagleyd@tux.org>

         The latest version is currently at:
              ftp://ftp.tux.org/pub/tux/bagleyd/xlockmore
              ftp://ftp.x.org/contrib/applications

         Original Author:
              Patrick J. Naughton, <naughton@eng.sun.com>
              Mailstop 21-14
              Sun Microsystems Laboratories, Inc.
              Mountain View, CA  94043
              415/336-1080

         with many additional contributors.

## COPYRIGHT

         Copyright (c) 1988-1991 by Patrick J. Naughton
         Copyright (c) 1993-2005 by David A. Bagley

         Permission  to  use,  copy,  modify,  and  distribute   this
         software  and  its documentation for any purpose and without
         fee is hereby granted, provided  that  the  above  copyright
         notice  appear  in  all  copies and that both that copyright
         notice and this permission notice appear in supporting docu-
         mentation.
         The original BSD daemon is Copyright (c) 1988 Marshall  Kirk
         McKusick.  All Rights Reserved.
         DEC, HP, IBM, Linux, SCO, SGI,  and  Sun  icons  have  their
         respective copyrights.