Shell script to drive https://github.com/deweller/switchaudio-osx from Alfred

switch_audio.sh

#!/bin/bash

headphones="Generic USB Audio Device   "
speakers="Display Audio"
arg=$1

if [ "${arg}" = "headphones" ]; then
    target=${headphones}
elif [ "${arg}" = "speakers" ]; then
    target=${speakers}
else
    foo=$( /usr/local/bin/SwitchAudioSource -c )
    if [ "${foo}" = "${headphones}" ]; then
        target=${speakers}
        arg="speakers"
    else
        target=${headphones}
        arg="headphones"
    fi
fi
for type in "output" "input" "system"; do
    /usr/local/bin/SwitchAudioSource -t "$type" -s "$target" 2>&1 > /dev/null
done
/usr/local/bin/growlnotify --image /System/Library/PreferencePanes/Sound.prefPane/Contents//Resources/SoundPref.icns -name "Audio switcher" -m "Switched audio to $arg"