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Simulate typing but with mistakes
The output will show jerk, then wonderful person since echo parses the \b character.

Rename all files which contain the sub-string 'foo', replacing it with 'bar'
Would this command line achieve the desired function? My CLI knowledge is not great so this could certainly be wrong. It is merely a suggestion for more experienced uses to critique. Best wishes roly :-)

USE WITH CAUTION: perminately delete old kernel packages

List the libraries used by an application
For example, you need to make a copy of all the libraries that a certain application uses, with this command you can list and copy them.

Generate an XKCD #936 style 4 word password
4 random words are better than one obfuscated word http://xkcd.com/936/

rename a file to its md5sum

Print all git repos from a user (only curl and grep)

Current running process ordered by %CPU
Useful to detect which process is causing system loads. It shows process PID so as we can take further actions.

Purge configuration files of removed packages on debian based systems

Encode a file to MPEG4 format
Encode video.avi into newvideo.avi using the libav codec to produce an MPEG4 file with a bitrate of 800


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