$ [sudo] npm i -g itunes-cli

$ [sudo] pip install itunes-cli

usage: itunes command [args]

Available commands:

    play        play current track
    pause       pause current track
    next        next track
    prev        previous track
    stop        stop play

    playlists   playlists names

    volume      get/set iTunes volume
    mute        mute sound
    unmute      unmute sound
    muted       true/false if muted

    kill        kill iTunes.app
    pid         iTunes.app pid

run `itunes COMMAND --help` for more infos

$ itunes play
$ itunes pause
$ itunes stop
$ itunes next
$ itunes previous

$ itunes volume 50
$ itunes volume
50

$ itunes mute
$ itunes muted
true
$ itunes unmute

$ itunes pid
42
$ itunes kill