Commands using quota (1)

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prevents replace an existing file by mistake
Use set +o noclobber and you will be able to replace files again

Save an HTML page, and covert it to a .pdf file
Uses htmldoc to perform the conversion

rsync...

Generate a random text color in bash
The expression $(( $RANDOM * 6 / 32767 + 1 )) generates a random number between 1 and 6, which is then inserted into the escape sequence \e[3_m to switch the foreground color of the terminal to either red, green, yellow, blue, purple or cyan. The color can be reset using the escape sequence \e[0m. The full list of colors can be found here: https://wiki.archlinux.org/index.php/Color_Bash_Prompt#List_of_colors_for_prompt_and_Bash

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Cleanup firefox's database.

Center text in console with simple pipe like
Center the output text in max line length of buffered output pipe;

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

du and sort to find the biggest directories in defined filesystem
This command give a human readable result without messing up the sorting.

printing barcodes
64 elements max on 16 rows, 4 cols. GNU Barcode will adapt automagically the width and the eight of your elements to fill the page. Standard output format is PostScript.

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