vncviewer(1)               Virtual Network Computing              vncviewer(1)


       vncviewer - VNC viewer for X


       vncviewer [options] [host][:display#]
       vncviewer [options] -listen [port]


       vncviewer  is  a  viewer  (client) for Virtual Network Computing.  This
       manual page documents version 4 for the X window system.

       If you run the viewer with no arguments it will prompt you  for  a  VNC
       server  to  connect  to.   Alternatively,  specify the VNC server as an
       argument, e.g.:

              vncviewer snoopy:2

       where ’snoopy’ is the name of the machine, and ’2’ is the display  num-
       ber of the VNC server on that machine.  Either the machine name or dis-
       play number can be omitted.  So for example ":1" means display number 1
       on  the  same  machine, and "snoopy" means "snoopy:0" i.e. display 0 on
       machine "snoopy".

       If the VNC server is successfully contacted, you will be prompted for a
       password  to  authenticate  you.   If the password is correct, a window
       will appear showing the desktop of the VNC server.


       The viewer tests the speed of the connection to the server and  chooses
       the encoding and pixel format (colour level) appropriately.  This makes
       it much easier to use than previous versions  where  the  user  had  to
       specify arcane command line arguments.

       The  viewer  normally starts out assuming the link is slow, using a low
       colour level and using the encoding with the best compression.   If  it
       turns  out that the link is fast enough it switches to full-colour mode
       and will use an encoding which compresses less but is faster to  gener-
       ate,  thus  improving the interactive feel.  Automatic selection can be
       turned off by setting the AutoSelect parameter to false,  or  from  the
       options dialog.


       The  viewer  has  a popup menu containing entries which perform various
       actions.  It is usually brought up by pressing F8, but this can be con-
       figured  with  the MenuKey parameter.  Actions which the popup menu can
       perform include:

         * switching in and out of full-screen mode

         * quitting the viewer

         * generating key events, e.g. sending ctrl-alt-del

         * accessing the options dialog and various other dialogs

       By default, key presses in the popup menu get sent to  the  VNC  server
       and  dismiss the popup.  So to get an F8 through to the VNC server sim-
       ply press it twice.


       A full-screen mode is supported.  This is particularly useful when con-
       necting to a remote screen which is the same size as your local one. If
       the remote screen is bigger,  you  can  scroll  by  bumping  the  mouse
       against the edge of the screen.

       Unfortunately  this  mode  doesn’t work completely with all window man-
       agers, since it breaks the X window management conventions.


       You can get a list of parameters by giving -h as a command-line  option
       to  vncviewer.   Parameters  can  be  turned on with -param or off with
       -param=0.  Parameters which take a value can  be  specified  as  -param
       value.   Other  valid forms are param=value -param=value --param=value.
       Parameter names are case-insensitive.

       Many of the parameters can also be set graphically via the options dia-
       log box.  This can be accessed from the popup menu or from the "Connec-
       tion details" dialog box.

       -display Xdisplay
              Specifies the X display on which the VNC  viewer  window  should

       -geometry geometry
              Standard X position and sizing specification.

       -listen [port]
              Causes  vncviewer to listen on the given port (default 5500) for
              reverse connections from a VNC server.  WinVNC supports  reverse
              connections  initiated using the ’Add New Client’ menu option or
              the ’-connect’ command-line option.  Xvnc supports reverse  con-
              nections with a helper program called vncconfig.

       -passwd password-file
              If  you  are on a filesystem which gives you access to the pass-
              word file used by the server, you can specify it here  to  avoid
              typing it in.  It will usually be "~/.vnc/passwd".

              When  you  make a connection to a VNC server, all other existing
              connections are normally closed.  This option requests that they
              be  left  open,  allowing  you to share the desktop with someone
              already using it.

              Specifies that no keyboard or mouse events should be sent to the
              server.   Useful if you want to view a desktop without interfer-
              ing; often needs to be combined with -Shared.

              Start in full-screen mode.

              Use automatic selection of encoding and pixel format (default is
              on).   Normally  the viewer tests the speed of the connection to
              the  server  and  chooses  the   encoding   and   pixel   format
              appropriately.  Turn it off with -AutoSelect=0.

       -FullColour, -FullColor
              Tells the VNC server to send full-colour pixels in the best for-
              mat for this display.  By default a  low  colour  mode  is  used
              until  AutoSelect  decides  the link is fast enough.  However if
              the server’s native pixel format is colourmapped (as opposed  to
              truecolour) then the server’s format is used by default.

       -LowColourLevel level
              Selects  the  reduced  colour level to use on slow links.  level
              can range from 0 to 2, 0 meaning 8 colours, 1 meaning 64 colours
              (the default), 2 meaning 256 colours.

       -PreferredEncoding encoding
              This  option specifies the preferred encoding to use from one of
              "ZRLE", "hextile" or "raw".

              Render the mouse  cursor  locally  if  the  server  supports  it
              (default is on).  This can make the interactive performance feel
              much better over slow links.

       -WMDecorationWidth w, -WMDecorationHeight h
              The total width and height taken up by  window  manager  decora-
              tions.   This  is  used to calculate the maximum size of the VNC
              viewer window.  Default is width 6, height 24.

       -log logname:dest:level
              Configures the debug log settings.  dest can currently be stderr
              or stdout, and level is between 0 and 100, 100 meaning most ver-
              bose output.  logname is usually * meaning all, but you can tar-
              get  a  specific  source  file if you know the name of its "Log-
              Writer".  Default is *:stderr:30.

       -MenuKey keysym-name
              This option specifies the key which brings up  the  popup  menu.
              The  key  is  specified  as  an  X11  keysym  name (these can be
              obtained  by  removing  the  XK_  prefix  from  the  entries  in
              "/usr/include/X11/keysymdef.h").  Default is F8.

       -via gateway
              Automatically create encrypted TCP tunnel to the gateway machine
              before connection, connect  to  the  host  through  that  tunnel
              (TightVNC-specific).  By  default, this option invokes SSH local
              port forwarding, assuming that SSH client binary can be accessed
              as  /usr/bin/ssh. Note that when using the -via option, the host
              machine name  should  be  specified  as  known  to  the  gateway
              machine,  e.g.  "localhost" denotes the gateway, not the machine
              where  vncviewer  was   launched.   The   environment   variable
              VNC_VIA_CMD   can   override   the  default  tunnel  command  of
              /usr/bin/ssh -f -L "$L":"$H":"$R" "$G" sleep 20.    The   tunnel
              command  is executed with the environment variables L, H, R, and
              G taken the values of the local port number,  the  remote  host,
              the  port  number  on  the  remote host, and the gateway machine


       Xvnc(1), vncpasswd(1), vncconfig(1), vncserver(1)


       Tristan Richardson, RealVNC Ltd.

       VNC was originally developed by the  RealVNC  team  while  at  Olivetti
       Research Ltd / AT&T Laboratories Cambridge.  It is now being maintained
       by RealVNC Ltd.  See for details.

RealVNC Ltd                       03 Mar 2005                     vncviewer(1)

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