dbus-launch - Utility to start a message bus from a shell script

dbus-launch [--version] [--sh-syntax] [--csh-syntax] [--auto-syntax] [--exit-with-session] [--config-file=FILENAME] [PROGRAM] [ARGS...]

The dbus-launch command is used to start dbus-daemon from a shell script. It would normally be called from a user's login scripts. Unlike the daemon itself, dbus-launch exits, so backticks or the $() construct can be used to read information from dbus-launch.

With no arguments, dbus-launch will simply print the values of DBUS_SESSION_BUS_ADDRESS and DBUS_SESSION_BUS_PID.

You may specify a program to be run; in this case, dbus-launch will then set the appropriate environment variables and execute the specified program, with the specified arguments. See below for examples.

Finally, you may use the --sh-syntax, --csh-syntax, or --auto-syntax commands to cause dbus-launch to emit shell code to set up the environment. This is useful in shell scripts.

With the --auto-syntax option, dbus-launch looks at the value of the SHELL environment variable to determine which shell syntax should be used. If SHELL ends in "csh", then csh-compatible code is emitted; otherwise Bourne shell code is emitted. Instead of passing --auto-syntax, you may explicity specify a particular one by using --sh-syntax for Bourne syntax, or --csh-syntax for csh syntax. In scripts, it's more robust to avoid --auto-syntax and you hopefully know which shell your script is written in.

See http://www.freedesktop.org/software/dbus/ for more information about D-BUS. See also the man page for dbus-daemon.

Here is an example of how to use dbus-launch with an sh-compatible shell to start the per-session bus daemon:

## test for an existing bus daemon, just to be safe if test -z "$DBUS_SESSION_BUS_ADDRESS" ; then ## if not found, launch a new one eval `dbus-launch --sh-syntax --exit-with-session` echo "D-BUS per-session daemon address is: $DBUS_SESSION_BUS_ADDRESS" fi

You might run something like that in your login scripts.

Another way to use dbus-launch is to run your main session program, like so:

dbus-launch gnome-session

The above would likely be appropriate for ~/.xsession or ~/.Xclients.

The following options are supported:

--auto-syntax

Choose --csh-syntax or --sh-syntax based on the SHELL environment variable.

--config-file=FILENAME

Pass --config-file=FILENAME to the bus daemon, instead of passing it the --session argument. See the man page for dbus-daemon

--csh-syntax

Emit csh compatible code to set up environment variables.

--exit-with-session

If this option is provided, a persistent "babysitter" process will be created that watches stdin for HUP and tries to connect to the X server. If this process gets a HUP on stdin or loses its X connection, it kills the message bus daemon.

--sh-syntax

Emit Bourne-shell compatible code to set up environment variables.

--version

Print the version of dbus-launch

See http://www.freedesktop.org/software/dbus/doc/AUTHORS

Please send bug reports to the D-BUS mailing list or bug tracker, see http://www.freedesktop.org/software/dbus/