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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"

find process associated with a port
e.g. fuser 25/tcp (see which pid is listening on smtp)

Puts every word from a file into a new line
Basically it creates a typical word list file from any normal text.

Terminal Keyboard Shortcut list
This command will give you a list of available keyboard shortcuts according to stty.

check open ports without netstat or lsof

rsync should continue even if connection lost
Manage partial uploads using append option.

Clone or rescue a block device
If you use the logfile feature of ddrescue, the data is rescued very efficiently (only the needed blocks are read). Also you can interrupt the rescue at any time and resume it later at the same point. http://www.gnu.org/software/ddrescue/ddrescue.html

List the size (in human readable form) of all sub folders from the current location

Sort files in folders alphabetically
Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

Replace strings in text
-e is the script function, it performs search and replace like vi, and -i is the edit the file in place.

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