et: command not found
 

I've just emerged enemy territory. But when i type "et" in a console, i get

i really don't know what the problem is. I have accelerated graphics (ti 4200)

et is (probably) not in your PATH.

Start it using the complete path (something like /opt/et/et), or add the path to your PATH.

I personally prefer the first option.

Chances are A.) The installer didn't work B.) The executable isn't in your path or C.) The symlink doesn't point the executable. I currently have ET installed and the symlink is located in /usr/local/bin/et. First check to see if that exists, if it doesn't the installer might not have made a symlink. Check to see if you're install landed in /usr/local/games/enemy-territory. If this exists, the program did install it, there just isn't a symlink. This is easy to remedy, as root type
$ ln -s /usr/local/games/enemy-territory/et /usr/local/bin/et
This will then allow typing et, to work for you. If what I've said so far, doesn't help, try locating Enemy Territory, possibly the installer didn't work
$ locate et
If nothing comes up it's probably not installed on your system (unless you haven't updated the locate database since the emerging, update this by doing locate -u)
If it isn't there, I'd recommend installing it through the orignal installer. Just google for Enemy Territory Download and you'll find it. Good Luck!