Provided by: tigervnc-viewer_1.12.0+dfsg-4ubuntu0.22.04.1_amd64 
NAME
xtigervncviewer - VNC viewer for X
SYNOPSIS
xtigervncviewer [options] [host][:display#]
xtigervncviewer [options] [host][::port]
xtigervncviewer [options] [unix socket]
xtigervncviewer [options] -listen [port]
xtigervncviewer [options] [.tigervnc file]
DESCRIPTION
xtigervncviewer 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.:
xtigervncviewer snoopy:2
where 'snoopy' is the name of the machine, and '2' is the display number of the VNC server
on that machine. Either the machine name or display 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".
As another quick way to start a connection to a VNC server, specify a .tigervnc
configuration file as an argument to the viewer, e.g.:
xtigervncviewer ./some.tigervnc
where './some.tigervnc' is an existing and valid TigerVNC configuration file. The file
name needs to include a path separator. Additional options may be given too, but the
given configuration file will overwrite any conflicting parameters.
If the VNC server is successfully contacted, you will be prompted for a password to
authenticate you. You can also add 'VNC_USERNAME' and 'VNC_PASSWORD' to environment
variables. If the password is correct, a window will appear showing the desktop of the VNC
server.
AUTOMATIC PROTOCOL SELECTION
The viewer tests the speed of the connection to the server and chooses the encoding and
pixel format (color 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 the encoding with the best
compression. If it turns out that the link is fast enough it switches to an encoding
which compresses less but is faster to generate, thus improving the interactive feel.
The viewer normally starts in full-color mode, but switches to low-color mode if the
bandwidth is insufficient. However, this only occurs when communicating with servers
supporting protocol 3.8 or newer, since many old servers does not support color mode
changes safely.
Automatic selection can be turned off by setting the AutoSelect parameter to false, or
from the options dialog.
POPUP MENU
The viewer has a popup menu containing entries which perform various actions. It is
usually brought up by pressing F8, but this can be configured 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 simply press it twice.
FULL SCREEN MODE
A full-screen mode is supported. This is particularly useful when connecting 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.
OPTIONS (PARAMETERS)
You can get a list of parameters by giving -h as a command-line option to xtigervncviewer.
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 dialog box. This can
be accessed from the popup menu or from the "Connection details" dialog box.
-display Xdisplay
Specifies the X display on which the VNC viewer window should appear.
-geometry geometry
Initial position of the main VNC viewer window. The format is
widthxheight+xoffset+yoffset , where `+' signs can be replaced with `-' signs to
specify offsets from the right and/or from the bottom of the screen. Offsets are
optional and the window will be placed by the window manager by default.
-listen [port]
Causes xtigervncviewer 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. Xtigervnc
supports reverse connections with a helper program called tigervncconfig.
-SecurityTypes sec-types
Specify which security schemes to attempt to use when authenticating with the
server. Valid values are a comma separated list of None, VncAuth, Plain, TLSNone,
TLSVnc, TLSPlain, X509None, X509Vnc and X509Plain. Default is to attempt every
supported scheme.
-passwd, -PasswordFile password-file
If you are on a filesystem which gives you access to the password file used by the
server, you can specify it here to avoid typing it in. It will usually be
"~/.vnc/passwd".
-X509CA path
Path to CA certificate to use when authenticating remote servers using any of the
X509 security schemes (X509None, X509Vnc, etc.). Must be in PEM format. Default is
$HOME/.vnc/x509_ca.pem.
-X509CRL path
Path to certificate revocation list to use in conjunction with -X509CA. Must also
be in PEM format. Default is $HOME/.vnc/x509_crl.pem.
-Shared
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.
-ViewOnly
Specifies that no keyboard or mouse events should be sent to the server. Useful if
you want to view a desktop without interfering; often needs to be combined with
-Shared.
-AcceptClipboard
Accept clipboard changes from the server. Default is on.
-SetPrimary
Set the primary selection as well as the clipboard selection. Default is on.
-MaxCutText bytes
The maximum size of a clipboard update that will be accepted from a server.
Default is 262144.
-SendClipboard
Send clipboard changes to the server. Default is on.
-SendPrimary
Send the primary selection to the server as well as the clipboard selection.
Default is on.
-Maximize
Maximize viewer window.
-FullScreen
Start in full-screen mode.
-FullScreenAllMonitors (DEPRECATED)
Use all local monitors and not just the current one when switching to full-screen
mode. Replaced by -FullScreenMode=all
-FullScreenMode mode
Specify which monitors to use when in full screen. It should be either "Current",
"Selected" (specified by -FullScreenSelectedMonitors) or "All". The default is
"Current".
-FullScreenSelectedMonitors monitors
This option specifies the monitors to use with -FullScreenMode=selected. Monitors
are ordered according to the system configuration from left to right, and in case
of a conflict, from top to bottom. So, for example, "1,2,3" means that the first,
second and third monitor counting from the left should be used. The default is
"1".
-FullscreenSystemKeys
Pass special keys (like Alt+Tab) directly to the server when in full-screen mode.
-DesktopSize widthxheight
Instead of keeping the existing remote screen size, the client will attempt to
switch to the specified since when connecting. If the server does not support the
SetDesktopSize message then the screen will retain the original size.
-RemoteResize
Dynamically resize the remote desktop size as the size of the local client window
changes. Note that this may not work with all VNC servers.
-AutoSelect
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.
-FullColor, -FullColour
Tells the VNC server to send full-color pixels in the best format for this display.
This is default.
-LowColorLevel, -LowColourLevel level
Selects the reduced color level to use on slow links. level can range from 0 to 2,
0 meaning 8 colors, 1 meaning 64 colors (the default), 2 meaning 256 colors. Note
that decision if reduced color level is used is made by xtigervncviewer. If you
would like to force xtigervncviewer to use reduced color level use -AutoSelect=0
parameter.
-PreferredEncoding encoding
This option specifies the preferred encoding to use from one of "Tight", "ZRLE",
"hextile" or "raw".
-NoJpeg
Disable lossy JPEG compression in Tight encoding. Default is off.
-QualityLevel level
JPEG quality level. 0 = Low, 9 = High. May be adjusted automatically if -AutoSelect
is turned on. Default is 8.
-CompressLevel level
Use specified lossless compression level. 0 = Low, 9 = High. Default is 2.
-CustomCompressLevel
Use custom compression level. Default if CompressLevel is specified.
-DotWhenNoCursor
Show the dot cursor when the server sends an invisible cursor. Default is off.
-PointerEventInterval time
Time in milliseconds to rate-limit successive pointer events. Default is 17 ms (60
Hz).
-EmulateMiddleButton
Emulate middle mouse button by pressing left and right mouse buttons
simultaneously. Default is off.
-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 verbose output. logname is usually *
meaning all, but you can target a specific source file if you know the name of its
"LogWriter". Default is *:stderr:30.
-MenuKey keysym-name
This option specifies the key which brings up the popup menu. The currently
supported list is: F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, Pause,
Scroll_Lock, Escape, Insert, Delete, Home, Page_Up, Page_Down). Default is F8.
-via gateway
Automatically create encrypted TCP tunnel to the gateway machine before connection,
connect to the host through that tunnel (TigerVNC-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 xtigervncviewer 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 respectively.
-AlertOnFatalError
Display a dialog with any fatal error before exiting. Default is on.
-ReconnectOnError
Display a dialog with any error and offer the possibility to retry establishing the
connection. In case this is off no dialog to re-connect will be offered. Default is
on.
FILES
$HOME/.vnc/default.tigervnc
Default configuration options. This file must have a "magic" first line of
"TigerVNC Configuration file Version 1.0" (without quotes), followed by simple
<setting>=<value> pairs of your choosing. The available settings are those shown in
this man page.
$HOME/.vnc/x509_ca.pem
Default CA certificate for authenticating servers.
$HOME/.vnc/x509_crl.pem
Default certificate revocation list.
SEE ALSO
Xtigervnc(1), tigervncpasswd(1), tigervncconfig(1), tigervncsession(8)
https://www.tigervnc.org
AUTHOR
Tristan Richardson, RealVNC Ltd. and others.
VNC was originally developed by the RealVNC team while at Olivetti Research Ltd / AT&T
Laboratories Cambridge. TightVNC additions were implemented by Constantin Kaplinsky. Many
other people have since participated in development, testing and support. This manual is
part of the TigerVNC software suite.