itunes_controller.scpt

on run argv
     tell application "iTunes"
          set command to first item of argv
          if command = "play" then
               play
          else if command = "pause" then
               pause
          else if command = "next" then
               next track
          else if command = "prev" then
               previous track
          else
               return "command not found"
          end if
     end tell
end run

$ osascript itunes_controller.scpt pauseとか