Provided by: xvfb_1.10.1-1ubuntu1_i386 bug


       xvfb-run  -  run  specified  X  client or command in a virtual X server


       xvfb-run [ options ] command


       xvfb-run is a wrapper for the Xvfb(1x)  command  which  simplifies  the
       task of running commands (typically an X client, or a script containing
       a list of clients to be run) within a virtual X server environment.

       xvfb-run  sets  up  an  X  authority  file   (or   uses   an   existing
       user-specified  one),  writes  a  cookie to it (see xauth(1x)) and then
       starts the Xvfb X server as a background process.  The  process  ID  of
       Xvfb  is stored for later use.  The specified command is then run using
       the X display corresponding to the Xvfb server just started and  the  X
       authority file created earlier.

       When  the command exits, its status is saved, the Xvfb server is killed
       (using the process ID stored earlier), the X authority cookie  removed,
       and  the  authority  file  deleted  (if the user did not specify one to
       use).  xvfb-run then exits with the exit status of command,  except  in
       error conditions (see EXIT STATUS below).

       xvfb-run requires the xauth command to function.


       -a, --auto-servernum
              Try to get a free server number, starting at 99, or the argument
              to --server-num.

       -e file, --error-file=file
              Store output from xauth  and  Xvfb  in  file.   The  default  is

       -f file, --auth-file=file
              Store  X  authentication  data in file.  By default, a temporary
              directory called xvfb-run.PID (where PID is the  process  ID  of
              xvfb-run  itself)  is  created in the directory specified by the
              environment variable TMPDIR (or /tmp if that variable is null or
              unset),  and the tempfile(1) command is used to create a file in
              that temporary directory called Xauthority.

       -h, --help
              Display a usage message and exit.

       -n servernumber, --server-num=servernumber
              Use  servernumber  as  the  server  number  (but  see  the   -a,
              --auto-servernum option above).  The default is 99.

       -l, --listen-tcp
              Enable TCP port listening in the X server.  For security reasons
              (to avoid  denial-of-service  attacks  or  exploits),  TCP  port
              listening is disabled by default.

       -p protocolname, --xauth-protocol=protocolname
              Use  protocolname  as  the  X  authority  protocol  to use.  The
              default is '.',  which  xauth  interprets  as  its  own  default
              protocol, which is MIT-MAGIC-COOKIE-1.

       -s arguments, --server-args=arguments
              Pass  arguments  to  the  Xvfb  server.  Be careful to quote any
              whitespace characters that may occur within arguments to prevent
              them  from  regarded as separators for xvfb-run's own arguments.
              Also, note that specification of '-nolisten  tcp'  in  arguments
              may  override  the  function  of xvfb-run's own -l, --listen-tcp
              option, and that specification of the server number (e.g., ':1')
              may  be  ignored  because  of  the  way  the X server parses its
              argument      list.       Use      the      xvfb-run      option
              -n servernumber, --server-num=servernumber to achieve the latter
              function.  The default is '-screen 0 640x480x8'.

       -w delay, --wait=delay
              Wait delay seconds after launching  Xvfb  before  attempting  to
              start the specified command.  The default is 3.


              indicates  the  width of the terminal device in character cells.
              This value is used for formatting diagnostic messages.   If  not
              set,  the  terminal  is  queried  using stty(1) to determine its
              width.  If that fails, a value of '80' is assumed.

       TMPDIR specifies the directory in which to place  xvfb-run's  temporary
              directory  for storage of the X authority file; only used if the
              -f or --auth-file options are not specified.


       Unless the  -f  or  --auth-file  options  are  specified,  a  temporary
       directory  and  file within it are created (and deleted) to store the X
       authority cookies used by the Xvfb server and client(s) run  under  it.
       See  tempfile(1).   If -f or --auth-file are used, then the specified X
       authority file is only written to, not created or deleted (though xauth
       creates  an  authority  file  itself  if  told to use use that does not
       already exist).

       An error file with a user-specified name is also created if the  -e  or
       --error-file options are specifed; see above.


       xvfb-run  uses  its  exit status as well as output to standard error to
       communicate diagnostics.

       0      xvfb-run only uses this exit status if the -h, --help option  is
              given.   In  all  other  situations,  this may be interpreted as
              success of the specified command.

       1      Xvfb did not start correctly.

       2      No command to run was specified.

       3      The xauth command is not available.

       4      The temporary directory  that  was  going  to  be  used  already
              exists; since xvfb-run produces a uniquely named directory, this
              may indicate an attempt by another  process  on  the  system  to
              exploit a temporary file race condition.

       5      A  problem  was  encountered  while  cleaning  up  the temporary

       6      A problem was encountered while using  getopt(1)  to  parse  the
              command-line arguments.


       xvfb-run --auto-servernum --server-num=1 xlogo
              runs the xlogo(1x) demonstration client inside the Xvfb X server
              on the first available server number greater than or equal to 1.

       xvfb-run --server-args="-screen 0 1024x768x24" ico -faces
              runs the ico(1x) demonstration client (and passes it the  -faces
              argument)  inside  the  Xvfb  X  server,  configured with a root
              window of 1024 by 768 pixels and a color depth of 24 bits.

       Note that the demo X clients used in the above examples will  not  exit
       on their own, so they will have to be killed before xvfb-run will exit.


       See  the  Debian Bug Tracking System <>.  If
       you wish to report a bug  in  xvfb-run,  please  use  the  reportbug(1)


       xvfb-run  was  written  by  Branden  Robinson  and  Jeff  Licquia  with
       sponsorship from Progeny Linux Systems.


       Xvfb(1x), xauth(1x)