Mac OS X: volume control, etc.

Mac OS X: volume control, etc. 1. set the boot audio volume: mute: sudo nvram SystemAudioVolume = % 80 "minimum volume: sudo nvram SystemAudioVolume = % 00 maximum volume: sudo nvram SystemAudioVolume = 2 Note: when the user changes the volume in OS X, the system value also changes. 2. use script to adjust the volume: osascript-e "set volume 10" maximum volume = 10, minimum = 1, mute = 0 can also be muted without changing the volume: osascript-e "set volume output muted 1" enable sound-unmute: osascript-e "set volume output muted 0" 3. if you want to read text on Mac, you can use: say "Hello" 4. you can also use software to set the boot sound size/mute. The reason why there are so many software available is that even different Apple machines and operating systems may not be compatible with each other: Startup Chime Stopper 3.1: http://www.macupdate.com/info.php/id/13170/startup-chime-stopper Psst: http://www.satsumac.com/Psst.php StartupSound. prefPane: http://www5e.biglobe.ne.jp /~ Arcana/StartupSound/index.en.html 5. although many people do not like the boot sound, it is a method for Apple detection to notify users whether the computer works normally. If there is a problem with the computer hardware, there will be different dong sounds. 6. You can use the shell script to control it by yourself: for OS X 10.4, You can edit/etc/rc. shutdown. local and add the following line:/usr/sbin/nvram SystemAudioVolume = % 80