Are you constantly scared by the startup sound when you start your Mac or feel awkward when the sound annoys people around you when you use your Mac in a public place? Here are two scripts that can save you - one mute the Mac when log out OSX and the other one unmute your Mac after you log in.

Here are the steps:

  • Create the script to mute the Mac: sudo nano /Library/Scripts/mute.sh

    #!/bin/bash

osascript -e 'set volume output muted 1'

  • Create the script to unmute the Mac: sudo nano /Library/Scripts/unmute.sh

    #!/bin/bash

osascript -e 'set volume output muted 0'

  • Add execute permission to the scripts

    sudo chmod u+x /Library/Scripts/mute.sh

    sudo chmod u+x /Library/Scripts/umute.sh

  • Add the two scripts to login and logout hook respectively

    sudo defaults write com.apple.loginwindow LogoutHook /Library/Scripts/mute.sh

    sudo defaults write com.apple.loginwindow LoginHook /Library/Scripts/unmute.sh

  • If you want to undo the changes

    sudo defaults delete com.apple.loginwindow LoginHook

    sudo defaults delete com.apple.loginwindow LogoutHook