What are your favourite & most useful *nix COMMANDs ? [Post them here]
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I obviously use cd and ls a hell of alot but my favorites are probably chown -R, chmod, ls | less, cat, rm -rf and i know its not a command but tab completion is such a great thing. In college i have to use dos and i dont mind using it but the fact i cant just speed things up with a quick press of tab really annoys me.
And for all the newbies out there, doing this will delete your whole system... so this shouldn't be done. If your going to make jokes, please put smilies in your posts. Sadly there are users unaware of how dangerous some commands may be.
I like "top" to see which processes are really stressing the system. Second favorite is ofcourse: "killall -KILL <appname>" to erase a process by name without delay (this is not the proper way to close a process).
I also really like "|" to combine commands. It makes, for example, the "locate" - "grep" combo more powerful then that Google desktop thingy Windows users are so proud of.