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Use tee + process substitution to split STDOUT to multiple commands
Using process substitution, we can 'trick' tee into sending a command's STDOUT to an arbitrary number of commands. The last command (command4) in this example will get its input from the pipe.

Adding Prefix to File name
Adding course name prefix to lecture pdfs

Change a specific value in a path
Awk replaces the value of a specific field while retaining the field separator "/" .

Comparison between the execution output of the last and penultimate command
Useful for checking if there are differences between last and penultimate command.

Compute the numeric sum of a file
In the file data.txt there is a single column of numbers. Sed adds a "+" between lines and xargs prepares the output for bc. The "echo 0" is to avoid to have a "+" at the beginning of the line.

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

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

list block devices
Shows all block devices in a tree with descruptions of what they are.

using scanner device from command line
you have to replace "mustek_usb" with the scanner found by `scanimage -l`

How to get an absolute value
Whenever we are only interested in difference between two numbers and not the positive/negative values we can use this in script.


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