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MySQL dump restore with progress bar and ETA
Display a progress bar while restoring a MySQL dump.

read a file line by line and perform some operation on each line
see sample output

Avoid killing the X server with CTRL+C on the tty it was started from

List open sockets protocol/address/port/state/PID/program name

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Find recursively, from current directory down, files and directories whose names contain single or multiple whitespaces and replace each such occurrence with a single underscore.
Note the g for global in the perl expression; without it, only the first occurrence in the name would be replaced.

First file editor for newbies
This command should be the first file-editing command for a newbie. It clears file.txt (cat), and asks for input until EOF is entered on its own line (not written to file.txt).

add the result of a command into vi
':r!ls -l' results in listing the files in the current directory and paste it into vi

Emptying a text file in one shot
Within vi allow to empty a text file in one shot

list all file extensions in a directory
... plus do a sort according frequency


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