I'm logged in as root, but none of the administrative commands seem to work. Typing basics like "su" or "ps" or "startx" just give me a "bash: xxx command not found." I can "ls" and "cd", but I cannot do the things root is suppose to do.

Any thoughts?

Did the command prompt change to a "#" (without the quotes)? If not, you are not logged as SU. If yes, command not found implies the system can not locate the binary executable such as ps.

pwd will tell you what directory you are in, and does not (usually) require root privliges. The path root has is different than normal users.

Would you post the distribution you are using? I would also suggest you use "locate" or there is a "find file" GUI program to find out where the binarys are you wish to locate. Try switching to the directory where they are and see if that helps.

Type 'echo $PATH' and see where executables are. It's unreal (but possible?) that u just have no them... I found ps in /bin
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Thanks,

The prompt has changed to "#". I've moved to the /usr/bin directory and "ps" now works. I think I know what might have happend. I installed postgresql yesterday and changed $PATH. I thought I was just adding the Postgres/bin directory, but it seems that I overwrote the whole $PATH. Thanks for your help.