Diverse to sort

tldr

simplified man pages
https://tldr.sh/

pet

terminal  snippet manager
https://linuxthegreat.wordpress.com/2017/03/19/pet-a-command-line-snippet-manager-for-linux/comment-page-1/

systemd

terminal based system & service manager for linux os

BleachBit

app to clean Linux usage
do not use it (can have adverse effect according to ineternet)
ik heb mijn eigen bash script gemaakt met de nodige acties

eject cd , even if it mounted  
(description of a bash script on how to do that)
https://askubuntu.com/questions/226638/how-to-eject-a-cd-dvd-from-the-command-line

packages:
exif-extentions for nemo
exif library for perl  (pacvkage needed for roll indexerer to index
metadata of media files