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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"

Recursive Search and Replace
Finds the string in every file in an entire directory and all its subdirectories and replaces it with a new string. Especially useful when changing a machine's IP address or hostname - run it on /etc.

Remove all unused kernels with apt-get
Note the double space: "...^ii␣␣linux-image-2..." Like 5813, but fixes two bugs: [1]This leaves the meta-packages 'linux-headers-generic' and 'linux-image-generic' alone so that automatic upgrades work correctly in the future. [2]Kernels newer than the currently running one are left alone (this can happen if you didn't reboot after installing a new kernel). I'm bummed that this took 228 characters. I'd like to see a simpler version.

Top ten (or whatever) memory utilizing processes (with children aggregate) - Can be done without the multi-dimensional array

Click on a GUI window and show its process ID and command used to run the process
This command is useful when you want to know what process is responsible for a certain GUI application and what command you need to issue to launch it in terminal.

Play all files in the directory using MPlayer
Skip forward and back using the < and > keys. Display the file title with I.

Short Information about loaded kernel modules

Connect-back shell using Bash built-ins

Email HTML content
Note, this works because smtp is running

Fill the screen with randomly colored lines
This one-liner fills the screen with randomly colored lines.


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