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Prints line numbers
If you don't have nl on your system, this achieves a similar effect, the default behavior in nl is to not number blank lines, but this does.

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"

calculate the total size of files in specified directory (in Megabytes)

Find the package that installed a command

Find the biggest files on your hard drive

List files with full path
This version is a bit more portable although it isn't extended as easily with '-type f' etc. On AIX the find command doesn't have -maxdepth or equivalent.

Combine cssh and shell expansion to execute commands on a large cluster
This will open an awful lot of little windows, but is quite useful if you want to quickly patch something on a cluster of servers.

Parse YouTube url (get youtube video id)
url can be like any one of followings: $url="MejbOFk7H6c" $url="http://youtu.be/MejbOFk7H6c" $url="https://youtube.com/watch?feature=player_embedded&v=MejbOFk7H6c#t" $url="//www.youtube.com/v/MejbOFk7H6c?hl=ru_RU&version=3&rel=0" $url="http://www.youtube.com/embed/MejbOFk7H6c?feature=player_embedded" If url mismatching, whole url will be returned.

Get the SAN (subjectAltName) of a site's certificate.
Based on http://stackoverflow.com/questions/13127352/checking-alternative-names-for-a-san-ssl-cert Replace "facebook.com" with the desired hostname.

Show the key code for keyboard events include the Fn keys
The keycodes are a result of pressing: Mute (Fn+F1) a


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