Steam console
From wikinotes
Steam has a command console that you can use to interact with it's API.
Usage
Launch steam with
open 'steam://open/console' # launch steam with console tab presentThen search for, and find documentation for commands
find SEARCHWORD
Commands
Some useful commands
apps_installed # list all installed apps, and APPIDs app_uninstall 12345 # uninstall an APPID