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Does a full update and cleaning in one line

convert all files in a dir of a certain type to flv
This converts all m4a files in a dir to flv. You can just swap the m4a bit to anything else ffmpeg supports though, and it'll work.

count IPv4 connections per IP
usefull in case of abuser/DoS attacks.

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"

change dinosaur poop into gold
if firefox is running the database is locked, so you need to copy the places.sqlite file temporarily somewhere to be able to query it...

list files recursively by size

Password generator
https://xkcd.com/936/ introduced us to what actually is a good password. Here's such an implementation. Credit: quinq on #suckless

make directory tree

Remove all the files except abc in the directory
This is for zsh with extended globbing.

List bash functions defined in .bash_profile or .bashrc


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