recursive find and replace. important stuff are grep -Z and zargs -0 which add zero byte after file name so sed can work even with file names with spaces.

This command is recursive and will delete in all directories in ".". It will find and delete all files not specified with ! -name "pattern". In this case it's file extensions. -type f means it will only find files and not directories. Finally the -delete flag ask find to delete what it matches. You can test the command by running it first without delete and it will list the files it will delete when you run it. Show Sample Output

you can change the size :)

Extract in the current directory the content of all parted archives. Use the same password for each one.

must be in the directory containing the track outputs to ~ but could be replaced with whatever you like e.g. ~/music/

This is for bash - make an alias - also a good blueprint for making aliases that take arguments to functions. If for Solaris use "-size +${1}000000c" to replace "-size +${1}M" Show Sample Output

print sum of disk usage for filetype within current dir and subdirs Show Sample Output

Replace .py with .rb or .java to get the LOC of that particular filetype. An alternative is http://www.commandlinefu.com/commands/view/2812/make-a-statistic-about-the-lines-of-code Show Sample Output

Change "sort -f" to "sort" and "uniq -ic" to "uniq -c" to make it case sensitive. Show Sample Output

Find all files in /var/spool/mqueue older than 7 days, pass to perl to efficiently delete them (faster than xargs or -exec when you've got millions or hundreds of thousands to delete). Naturally the type, directory, and file age vars can be adjusted to meet your specific needs.

-sl : show just file names

Find which directories on your system contain a lot of files. Edit: much shorter and betterer with -n switch. Show Sample Output

Requires ImageMagick to be installed. This command was stolen from @climagic on Twitter. Probably a duplicate of command below, but this command uses slightly higher quality. http://www.commandlinefu.com/commands/view/707/compress-images-using-convert-imagemagick-in-a-bulk

Enhancement for the 'busy' command originally posted by busybee : less chars, no escape issue, and most important it exclude small files ( opening a 5 lines file isn't that persuasive I think ;) ) This makes an alias for a command named 'busy'. The 'busy' command opens a random file in /usr/include to a random line with vim.

You could avoid xargs and sed in this case (shorter command and less forking): At least bash and zsh have some mighty string modifiers. I would also suggest using find with exec option to get more flexibility. You may leave out or include "special" file for example.

Better awk example, using only mplayer, grep, cut, and awk. Show Sample Output

This sums up the page count of multiple pdf files without the useless use of grep and sed which other commandlinefus use. Show Sample Output