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easily find megabyte eating files or directories
sorts the files by integer megabytes, which should be enough to (interactively) find the space wasters. Now you can $ dush for the above output, $ dush -n 3 for only the 3 biggest files and so on. It's always a good idea to have this line in your .profile or .bashrc

Override and update your locally modified files through cvs..

Extract a bash function
I often need to extract a function from a bash script and this command will do it.

HDD Performance Write Test
Test your XFS filesystem and Raptor hard drives for write performance.

get the ascii number with bash builtin printf

Multi-line grep
Using perl you can search for patterns spanning several lines, a thing that grep can't do. Append the list of files to above command or pipe a file through it, just as with regular grep. If you add the 's' modifier to the regex, the dot '.' also matches line endings, useful if you don't known how many lines you need are between parts of your pattern. Change '*' to '*?' to make it greedy, that is match only as few characters as possible. See also http://www.commandlinefu.com/commands/view/1764/display-a-block-of-text-with-awk to do a similar thing with awk. Edit: The undef has to be put in a begin-block, or a match in the first line would not be found.

Matrix Style
Same as the cool matrix style command ( http://www.commandlinefu.com/commands/view/3652/matrix-style ), except replacing the printed character with randomness. The command mentioned is much faster and thus more true to the matrix. However, mine can be optimized, but I wasted ... i mean spent enough time on it already

Print a row of 50 hyphens
essentially the ruby one, but perhaps has a larger installed base

List detailed information about a ZIP archive
list zipfile info in long Unix ``ls -l'' format.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"


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