Mute the Mac OS X startup sound, the fastest way
13 Oct 2012
Copy/paste lines below and put in your password when prompted to disable OS X startup chime.
This code will create two shell scripts,
/usr/local/bin/mute that will execute these AppleScripts:
After this, the code will bind those scripts to the LoginHook and LogoutHook handlers: when you will log out, sound will be muted, after you logged in, sound will be un-muted.
If you want to restore startup chime, type: