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See udev at work
See how your system works with pendrives/mice/monitors/whatever-you-can-plug-in. Use cases: see on which /dev/... your peripherals are, find out if a specific udev rule is being applied correctly.

Leap year calculation

To print a specific line from a file
You can get one specific line during any procedure. Very interesting to be used when you know what line you want.

Factorial With Case
Computes factorials.

Port scan a range of hosts with Netcat.
Simple one-liner for scanning a range of hosts, you can also scan a range of ports with Netcat by ex.: nc -v -n -z -w 1 192.168.0.1 21-443 Useful when Nmap is not available:) Range declaration like X..X "for i in {21..29}" is only works with bash 3.0+

Log your internet download speed
This will log your internet download speed. You can run $gnuplot -persist

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

Copy via tar pipe while preserving file permissions (cp does not!; run this command with root!)
cp options: -p will preserve the file mode, ownership, and timestamps -r will copy files recursively also, if you want to keep symlinks in addition to the above: use the -a/--archive option

a function to find the fastest free DNS server
Uses GNU Parallel.

all out
How to force a userid to log out of a Linux host, by killing all processes owned by the user, including login shells:


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