Favorite CLI command and tool?

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http://crunchbanglinux.org – I was trying to come up with a quick demo today of why the command line is so great (assuming you know what you are doing).  The demo I used got me wonder what everyones favorite commands and CLI tools are.When unpacking archives I often end up with an extra directory.  The demo I used for the power of the command line was cd into the inner directory then: mv * .. doing that in the GUI is a pain, while it takes just a second on the command line.For command line tool, obviously vim and ssh get huge honorable mentions, but the tool that always amazes me is netcatSo what's your fa (HowTos)