Commands using man (67)

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Ext3 format Terabytes in Seconds

Watch command
Repeat command after every 2 secs

Unrar multiple directories into current working directory
Grabs all rar files in any current subdirectories and feeds it to unrar. Doesn't work well with things packaged like file.part01.rar. Works best with File.rar. You can recurse into other directories by adding more /*'s

Print trending topics on Twitter

Find all files larger than 500M and less than 1GB

Remove all unused kernels with apt-get
Remove old kernels (*-generic and *-generic-pae) via apt-get on debian/ubuntu based systems. Tested on ubuntu 10.04 - 12.04.

Print current runlevel
Prints current runlevel and system start time. On older systems it also shows the last init state. Pretty useful on remote systems, pretty useless on local ones :)

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"

Deleting / Ignoring lines from the top of a file

Check the package is installed or not. There will show the package name which is installed.
The ^python$ is a package name patten. You can change whatever you want.


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