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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.

Get your IP addresses
Shows the interface and the ip-address

View the current number of free/used inodes in a file system
tune2fs also provides the same information . But the information does not give the current usage , it gives the information when the file system was last mounted. http://www.zaman4linux.in/2010/10/using-up-all-the-free-inodes.html

This is how you should push a string in a command's stdin.
Don't do this: $echo word | command Using a bash "here strings" and "here documents" look leeter than piping echo into the command. Also prevents subshell execution. Word is also expanded as usual.

Displays the number of processes per state

Perl Command Line Interpreter
Read, Evaluate, Print, Loop - REPL

Generate random valid mac addresses
Python Alternative

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

calculate in commandline with bash
Only works for integer arithmetic.

Given $PID, print all child processes on stdout
Simpler.


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