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

HOME USE ONLY: Get rid of annoying Polkit password prompts
Although the need to type a password to make certain changes to the system may make perfect sense in a business or educational environment, it makes absolutely zero sense to the home user. So, if you’re at home and would rather get work done than be annoyed by what is essentially Linux’s UAC, then this command is for you.

Shows size of dirs and files, hidden or not, sorted.

use the previous commands params in the current command
Here the !!:1 will take the first parameter from the previous command. This can be used in conjunction with other history commands like ! and so on.

Ergo browsing 'pacman' queries (Arch)
Alternative1 (grep support): pacman -Ss python | paste - - | grep --color=always -e '/python' | less -R Alternative2 (eye-candy, no grep): pacman --color=always -Ss "python" | paste - - | less -R in ~/.bashrc: pkg-grep() { pacman -Ss "$1" | paste - - | grep --color=always -e "${2:-$1}" | less -R ; } pkg-search() { pacman --color=always -Ss "python" | paste - - | less -R; }

Recursively remove .svn directories

Extract audio track from a video file using mencoder
Extracts an MP3 encoded audio stream from an input video file.

generate a random 10 character password
Generate a table of random 10 character passwords

Identify differences between directories (possibly on different servers)
This can be much faster than downloading one or both trees to a common servers and comparing the files there. After, only those files could be copied down for deeper comparison if needed.

Join lines
Even shorter. Stolen from comment posted by eightmillion.


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