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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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get header and footer of file for use with scalpel file carving
file carving helps if you know where the file you are looking for starts and ends. It's also an easy way to get data and catalog them for future use with forensic tools like scalpel.

External IP (raw data)
can be used in script like : echo $(wget -qO- http://utils.admin-linux.fr/ip.php)

Install pip with Proxy
Installs pip packages defining a proxy

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"

Start a HTTP server which serves Python docs
I use this command to start a local Python document server over HTTP port 8888.

Update Ping.fm status
Updates your Ping.fm status and websites supported by ping.fm (like twitter, facebook, and google talk).

Start a game on the discrete GPU (hybrid graphics)
On laptops featuring hybrid graphics and using the free X drivers, the DRI_PRIME variable indicates which GPU to run on. This alias allows to utilize the faster discrete GPU without installing proprietary drivers.

Switch 2 characters on a command line.
If you typed 'sl', put the cursor on the 'l' and hit ctrl-t to get 'ls'.

Install pip with Proxy
Installs pip packages defining a proxy

function to compute what percentage of X is Y? Where percent/100 = X/Y => percent=100*X/Y
This function make it easy to compute X/Y as a percentage. The name "wpoxiy" is an acronym of "what percentage of X is Y"


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