caffeinate

Prevent macOS from sleeping. More information: https://ss64.com/osx/caffeinate.html.

Prevent from sleeping for 1 hour (3600 seconds):

caffeinate -u -t {{3600}}

Prevent from sleeping until a command completes:

caffeinate -s "{{command}}"

Prevent from sleeping until you type Ctrl-C:

caffeinate -i