OSX software updates via command line

Just use the following command:

softwareupdate -i -a

This installs all available updates, but doesn’t restart, so that might need to be done manually.

The blurb:

usage: softwareupdate [ ...]

-l | --list List all appropriate updates
-d | --download Download Only
-i | --install Install

Per-user preferences:
--ignore

-v | --verbose Enable verbose output
-h | --help Print this help