caffeinate -i <somecommand> | prevent system from sleeping whilst command is running
Ctrl-1/2/3 | switch desktop
Cmd-Shift-. | toggle hidden file display in Finder
Option-Delete | delete previous word
a | zoom out to page
r | rotate
s | zoom to page width
feh (image viewer)
/ | zoom out to show entire image
<up> | zoom in
<down> | zoom out
<, > | rotate
journalctl
journalctl --since=yesterday | output from beginning of yesterday
journalctl --since=-1week | output from 1 week ago
journalctl CONTAINER_NAME="docker_container" | output from docker container
journalctl --user -u xyz.service | output from specific user service
Linux
getent hosts <hostname> | look up DNS name
pdfunite | combine PDFs on comand line
hardlink | combine duplicate files using hardlinks
Audio file manipulation
eyeD3 --add-image "cover.jpg:FRONT_COVER" test.mp3 | add image to MP3