How to logout of KDE using the terminal?

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Hi

Those two commands work

$ gnome-session-save --kill

$ killall gnome-session

You can also use pkill. This can also be done by another user (e.g. root).

pkill -KILL -u {username}

The username can be found by running who or w.

gnome-session-quit

If you want a logout option in your User menu, run

gsettings set org.gnome.shell always-show-log-out true

as an ordinary user.

Edit: This is assuming you're running GNOME.