How do I logout from a computer using shell?

How can I log out of my computer using shell such the log-in window appears again?

I need this functionality in one my Linux script.

Update: I want to replicate the 开发者_如何学Ccode working behind the Logout button of my Ubuntu.

Desktop Enviroment being used: GNOME

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I think this does the job:

gnome-session-save --logout

Also, take a look at the --help output, maybe you want to use the --force-logout option.

Usage:
  gnome-session-save [OPTION...]

Help Options:
  -h, --help               Show help options
  --help-all               Show all help options
  --help-gtk               Show GTK+ Options

Application Options:
  --logout                 Log out
  --force-logout           Log out, ignoring any existing inhibitors
  --logout-dialog          Show logout dialog
  --shutdown-dialog        Show shutdown dialog
  --gui                    Use dialog boxes for errors
  --display=DISPLAY        X display to use

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Your question is a bit vague. Are you trying to log out of a graphical session of a desktop environment (such as KDE/Gnome), as if the user clicked on "log off"?

Then you need to find out if/how the desktop environment supports scripting to log out. On KDE for example you can use kquitapp.

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Try restarting the display manager using one of the following, depending one which one you're using. You'll obviously have to have the proper permissions.

/etc/init.d/xdm restart
/etc/init.d/kdm restart
/etc/init.d/gdm restart

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It's a bit of a hack, but the way that screen's power detach does this is to determine its parent pid and send it a SIGHUP. (Clarification: This closes only the shell, so only works if you're running from a console - not a graphical login - so may not be what you're looking for.)

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Type in terminal

gnome-session-quit

or

pkill -kill -u {Username}