macOS command-line tools you might not know about

I'll go for the somewhat obsolete `drutil eject` as Mac OS can be sometimes rather reluctant to eject cycle optical drives if it doesn't actually think a disc in in them. Although nowadays you'll probably be using a 3rd party tray load drive with an eject button instead of a no-button slot loading Apple one.

My LG Blu-Ray drive ignores its eject button if it's connected to a Mac, unless the drive is empty, so I use this, too.