Today I used a bash script for the first time. I didn't know what one was but needed to batch convert a bunch of videos via #ffmpeg.
Luckily somebody had a tiny script that did it, and all I had to do was save as .sh and execute.
Answer from 2013, still functional today! https://askubuntu.com/questions/351593/bulk-batch-convert-mp4-and-m4v-files-to-webm-via-command-line
Gotta love #OpenSource.