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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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scan folder to check syntax error in php files

find the biggest file in current folder

Check which modules your PHP is using

Create a file and manipulate the date

Find broken symlinks and delete them
recursively deletes all broken symlinks using zsh globbing syntax.

show the date every rpm was installed
the newest rpms are at the top; individual packages can also be queried this way: rpm --last -q package

Clear the terminal screen

list files recursively by size

diff current vi buffer edits against original file

Get all IPs via ifconfig
works on Linux and Solaris. I think it will work on nearly all *nix-es


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