利用echo發出聲音

MacBook Pro ok.
nelsonchungteki-MacBook-Pro:~ nelsonchung$ echo $'\07'



Ref:
http://blog.longwin.com.tw/2011/10/shell-done-sound-alert-2011/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+tsungblog+%28Tsung%27s+Blog%29