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I'm using RH9 .My default boot level is 3 (shell), I can go to gui by typing "GDM" at shell but I want to know how to kill the gui and go back to shell without rebooting the system.
Hmm strange. You can kill gdm but that's not the proper way. With "ps -aux" you can find the process number then you can do "kill (number)". CTRL-ALT-BSP will also kill the xserver but IIRC gdm kept on restarting making it not useful. Other than that I'm out of suggestions.
ctrl-alt-bsp simply logs out and takes back to the gui login screen, killing it is something i could do but I can't find gdm, or the right one in the list.
Thanks for the suggestions though, maybe someone else will have more ideas.
EDIT: Killing the gdm-binary worked, I can use this for now unless someone else gives other suggestions.
Init 3 wouldn't have worked anyway because you're launching X without switching runlevel. If you have runlevel 5 (or 4 ?) set up for X in /etc/inittab you should use 'init 5' for GUI and 'init 3' to get back to CLI. init is usually in /sbin, did you use 'su -' to become root ? Just 'su' won't change your path.
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