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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

Terminal - Prints out, what the users name, notifyed in the gecos field, is

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

Extract shortcuts and hostnames from .ssh/config
Spits out table that shows your Host->HostName aliases in ~/.ssh/config

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

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

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

copy ACL of one file to another using getfacl and setfacl

Print a row of characters across the terminal
shorter than alternative


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