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As noted in 4, the X Window System is started either automatically using a display manager with a login window or from the command line by entering the startx command. Your X Window System server then loads, followed immediately by the window manager. You exit the window manager by choosing an exit or quit entry in the desktop workspace menu. The display manager and some window managers, such as FVWM2 and Window Maker, give you the option of starting other window managers. If you get into trouble and the window manager hangs, you can forcibly exit the X Window System with the keys CTRLALT-BACKSPACE. The desktop or window manager you start is the default window manager set up by your Linux distribution when you installed your system. Many distributions now use either Gnome or KDE as their default. For Gnome and the K Desktop, different window managers are used: kwm for the K Desktop and sawfish for Gnome. You can run Gnome or KDE applications on most window managers. To have Gnome use a particular window manager, you need to select it using the Gnome Control Center. You can also use a window manager in place of kwm for KDE. Check the window manager's Web site for current information on Gnome and KDE compatibility. Currently, Enlightenment is fully Gnome compliant, and AfterStep and Window Maker are nearly so. Red Hat only provides Enlightenment on its Publisher's Edition, and Window Maker is added for its Standard Edition. To use a different window manager, first install it. RPM packages install with a default configuration for the window manager. If you are installing from source code you compiled, follow the included installation instructions. You can then configure Gnome or KDE to use
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that window manager, provided it is compliant with them. See s 8 and 9 on how to configure the KDE and Gnome desktops. You can also configure your system to start a particular window manager without either desktop. There are several ways to do this, depending on whether you are starting your window manager from the graphical login (runlevel 5) or the command line with startx (runlevel 3). For the graphical login, you will need to make entries in the gdm and Xsession files. For a command line startup, you have the options of using the Red Hat desktop switcher to select a window manager, placing a Window Manager entry in the .wm_style file, or creating your own .Xclients file that invokes one.
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To invoke a window manager using a display manager like gdm, you first have to create an entry for it in the login window's session menu. You then must edit the session startup script and add code to select and start up that window manager. The startup script used for the Red Hat implementation of gdm is /etc/X11/xdm/Xsession. First, create an entry for the window manager in the session menu displayed in the gdm login window's options menu. Here you find files for other items listed in this menu. Simply create a file with the name of the entry you want displayed in the /etc/X11/gdm/Sessions directory (you can copy one of the scripts already there). On Red Hat, these scripts invoke the /etc/X11/xdm/Xsession script with an option for the particular window manager or desktop chosen. For example, to create an entry for Window Maker, you can create a file called winmaker as shown here. /etc/X11/gdm/Sessions/winmaker
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#!/bin/bash exec /etc/X11/xdm/Xsession wmaker
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To add another entry for Enlightenment, you can create a file called enlightenment as shown here. /etc/X11/gdm/Sessions/enlightenment
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#!/bin/bash exec /etc/X11/xdm/Xsession enlightenment
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You then must edit the /etc/X11/xdm/Xsession file to insert the code for selecting and starting the new window manager. Xsession contains detailed code, most of which you do not need to touch. In it is a case statement that lists the different window managers and desktops. Here you can enter a case entry for wmaker that the "wmaker" argument to Xsession will match on. The entry will execute the Window Maker program, wmaker. For Enlightenment you would add an entry for enlightenment.
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You can execute the window manager program directly, as Gnome is, or you can invoke either the switchdesk script for the window manager or, for certain older window managers, the RunWM script. Enlightenment has its own switchdesk script, while Window Maker has both a switchdesk script and RunWM support. RunWM currently only supports Window Maker, LessTiff, and AfterStep. For those, it is preferable to use RunWM as that script will run certain checks tailored for those window managers. In the following example, Window Maker is invoked with the RunWM script and the --maker option, whereas Enlightenment is invoked with its switchdesk script, Xclients.enlightenment:
# now, we see if xdm/gdm/kdm has asked for a specific environment case $# in 1) case $1 in failsafe) exec xterm -geometry 80x24-0-0 ;; gnome) exec gnome-session ;; kde|kde1|kde2) exec /usr/share/apps/switchdesk/Xclients.kde ;; enlightenment) exec /usr/share/apps/switchdesk/Xclients.enlightenment ;; wmaker) exec /usr/X11R6/bin/RunWM --wmaker ;; twm) # fall back to twm exec /usr/share/apps/switchdesk/Xclients.twm ;; esac esac
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