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           Xvfb [ option ] ...


           Xvfb  is  an X server that can run on machines with no display hardware
           and no physical input devices.  It emulates a  dumb  framebuffer  using
           virtual memory.
           The  primary use of this server was intended to be server testing.  The
           fb code for any depth can be exercised with  this  server  without  the
           need  for real hardware that supports the desired depths.  The X commu-
           nity has found many  other  novel  uses  for  Xvfb,  including  testing
           clients  against  unusual depths and screen configurations, doing batch
           processing with Xvfb as a background rendering engine, load testing, as
           an  aid  to  porting  the  X server to a new platform, and providing an
           unobtrusive way to run applications that don't really need an X  server
           but insist on having one anyway.


           In  addition  to  the normal server options described in the Xserver(1)
           manual page, Xvfb accepts the following command line switches:
           -screen screennum WxHxD
               This option creates screen screennum and sets  its  width,  height,
               and  depth  to W, H, and D respectively.  By default, only screen 0
               exists and has the dimensions 1280x1024x8.
           -pixdepths list-of-depths
               This option specifies a list  of  pixmap  depths  that  the  server
               should  support  in addition to the depths implied by the supported
               screens.  list-of-depths is a space-separated list of integers that
               can have values from 1 to 32.
           -fbdir framebuffer-directory
               This  option  specifies  the  directory  in which the memory mapped
               files containing the framebuffer memory  should  be  created.   See
               FILES.   This option only exists on machines that have the mmap and
               msync system calls.
               This option specifies that the framebuffer should be put in  shared
               memory.   The  shared  memory ID for each screen will be printed by
               the server.  The shared memory is in xwd format.  This option  only
               exists  on  machines that support the System V shared memory inter-
           If neither -shmem nor -fbdir is specified, the framebuffer memory  will
           be allocated with malloc().
           -linebias n
               This option specifies how to adjust the pixelization of thin lines.
               The value n is a bitmask of octants in which  to  prefer  an  axial
               file per screen.  The file is in xwd format.  Thus, taking a  full-
               screen  snapshot  can  be  done  with  a file copy command, and the
               resulting snapshot will even contain the cursor image.


           Xvfb :1 -screen 0 1600x1200x32
                   The server will listen for connections as server number 1,  and
                   screen 0 will be depth 32 1600x1200.
           Xvfb :1 -screen 1 1600x1200x16
                   The server will listen for connections as server number 1, will
                   have   the   default   screen   configuration   (one    screen,
                   1280x1024x8), and screen 1 will be depth 16 1600x1200.
           Xvfb -pixdepths 3 27 -fbdir /var/tmp
                   The server will listen for connections as server number 0, will
                   have   the   default   screen   configuration   (one    screen,
                   1280x1024x8),  will also support pixmap depths of 3 and 27, and
                   will use memory mapped files in /var/tmp for the framebuffer.
           xwud -in /var/tmp/Xvfb_screen0
                   Displays screen 0 of the server started by the preceding  exam-


           X(7), Xserver(1), xwd(1), xwud(1), XWDFile.h


           David P. Wiggins, The Open Group, Inc.

    X Version 11 xorg-server 1.11.3 XVFB(1)


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