vol

#!/usr/bin/env ruby

# Examples:
#   vol         Print the current sound volume
#   vol 30      Set the volume to 30%
#   vol mute
#   vol unmute

command = case ARGV.first
when 'mute' then "set volume output muted true"
when 'unmute' then "set volume output muted false"
when nil then "output volume of (get volume settings)"
else "set volume output volume #{ARGV.first.to_i}"
end

exec "osascript -e #{command.inspect}"