How to Disable Screensaver on Mac using the CLI
If you want to disable the Screensaver on your Mac, by using the Command Line Interface (CLI), then you can do the following:
Step 1 – See what is currently set
defaults read com.apple.screensaver
Step 2 – Set the idleTime
defaults -currentHost write com.apple.screensaver idleTime 0
Step 3 – (Optional) – Undo the change
defaults -currentHost delete com.apple.screensaver idleTime