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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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Find the package that installed a command

Print your cpu intel architecture family

Append last argument to last command
Just like "!$", except it does it instantly. Then you can hit enter if you want.

Check if the files in current directory has the RPATH variable defined
Using gentoo prefix portage I got in a situation where some packages did not contain the needed RPATH variable. This command helped me to find out which ones I should recompile

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"

Get the IP address

reverse order of file
awk reverse order of lines (emulates "tac")

open manpage and search for a string
This will open the manpage for "foobar", and display all instances of "searched_string". You can traverse through them by pressing "n"

Backup with versioning
Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net

Get last sleep time on a Mac


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