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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Search commandlinefu.com from the command line using the API
Usage: cmdfu hello world

count how many times a string appears in a (source code) tree
grep -o puts each occurrence in a separate line

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"

"What the hell is running on?!" Easily snoop your system's RAM consumption
Works on most unixes, on OpenBSD replace the "-g" parameter at the sort with a "-n".

Generate a sequence of numbers.

Lists installed kernels

Recursive find and replace file extension / suffix (mass rename files)
Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

kill ip connection
needed; apt-get install tcpkill

vi show line numbers
you don't have to spell out numbers, you can just use nu

Perl Command Line Interpreter
Can also just use the debug mode like this.


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