The GDM package provides the following commands in sbindir intended to be run by the root user:
The gdm command is really just a script which runs the gdm-binary, passing along any options. Before launching gdm-binary, the gdm wrapper script will source the <etc>/profile file to set the standard system environment variables. In order to better support internationalization, it will also set the LC_MESSAGES environment variable to LANG if neither LC_MESSAGES or LC_ALL are set. The gdm-binary is the actual GDM daemon.
Gives a brief overview of the command line options.
Print debug output to the syslog. This is typically <var>/log/messages or <var>/adm/messages depending on your Operating System.
Make all warnings cause GDM to exit.
Exit after 30 seconds. Useful for debugging.
Print the version of the GDM daemon.
gdm-restart stops and restarts GDM by sending the GDM daemon a HUP signal. This command will immediately terminate all sessions and log out users currently logged in with GDM.