Provided by:
gdm-2.20_2.20.10-0ubuntu3_i386 
NAME
GDM - The GNOME Display Manager
SYNOPSIS
gdm [options]
gdmsetup [options]
DESCRIPTION
GDM is a replacement for XDM, the X Display Manager. Unlike its
competitors (X3DM, KDM, WDM) GDM was written from scratch and does not
contain any original XDM / X Consortium code. GDM runs and manages the
X servers for both local and remote logins (using XDMCP). See
http://www.gnome.org/projects/gdm/ for more details.
gdm is main executable. gdmsetup is a graphical tool for easily
changing the most commonly used options.
For full documentation see the GNOME help browser under the
Applications / System Tools section.
OPTIONS
gdm and thus also gdm accept the following options:
-nodaemon
Do not fork into the background
--no-console
No console (local) servers to be run
--preserve-ld-vars
Preserve LD_* variables
--version
Print the GDM version
--help Print simple description of accepted options
gdmsetup accepts all standard GNOME options.
CONFIGURATION
Configuration is done either by running gdmsetup or by editting the
/etc/gdm/gdm.conf-custom file, which contains the overrides for
/etc/gdm/gdm.conf. The graphical tool does not support all the options
possible so editting the configuration file is sometimes necessary.
AUTHOR
GDM is being written and maintained by George (Jiri) Lebl
<jirka@5z.com> based on the original codebase by Martin K. Peterson
<mkp@mkp.net>.
SEE ALSO
X(7x), xdm(1), Xsecurity(7x), Xserver(1),