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Ultimate current directory usage command
Based on the MrMerry one, just add some visuals and sort directory and files

List your largest installed packages.
Requires the "wajig" package to be installed.

get function's source
no need to reinvent the wheel. Thanks to the OP for the "obsolete" hint. 'declare' may come in pretty handy on systems paranoid about "up-to-dateness"

wc in perl

Add sudo with shortcut alt+e in bash

Backup a file with a date-time stamp
Appends the input file with the date format YYYY-MM-DD.bak. Also runs silently if you remove the -v on the cp at the end of the function.

Quick searching with less
This command enables the user to append a search pattern on the command line when using less as the PAGER. This is especially convenient (as the example shows) in compressed files and when searching man pages (substituting the zcat command with man, however).

Delete all but latest file in a directory
Useful for deleting old unused log files.

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

Leap year calculation


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