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A library to manage NVRAM Stuff in Swift
https://iosexample.com/a-library-to-manage-nvram-stuff-in-swift/#:~:text=Getting%20value%20of%20existing%20NVRAM%20Variable%20use%20the,of%20NVRAM%20variable%20%22SystemAudioVolume%22%20let%20value%20%3D%20nvram.
terminal - Has Unix Parameter Name SystemAudioVolume Been ...
https://apple.stackexchange.com/questions/367502/has-unix-parameter-name-systemaudiovolume-been-changed-to-systemaudiovolume-db-i
Firstly, the sudo nvram SystemAudioVolume=%00 (or the same command with different values at end) never allowed users to actually change the startup chime sound. In earlier versions of Mac OS X it did allow users to change the volume, and therefore they could mute the startup chime, but this did not change the sound.
A library to manage NVRAM Stuff in Swift
https://iosexample.com/a-library-to-manage-nvram-stuff-in-swift/
use the OFVariableValue to get the value of an existing NVRAM Variable. Example: Example: let nvram = NVRAM () let nvramVariableName = " SystemAudioVolume " // Returns the value of NVRAM variable "SystemAudioVolume" let value = nvram.
What’s stored in NVRAM? – The Eclectic Light Company
https://eclecticlight.co/2018/08/24/whats-stored-in-nvram/
Changing values in NVRAM. You can alter the value of any variable in NVRAM using the nvram command in Terminal; for most if not all variables this requires that you assume root privileges using the sudo command, so you are best prefacing each command with sudo. Thus, the command sudo nvram BootAudio=%01
SystemAudioVolume not working in Yosemite · Issue …
https://github.com/mathiasbynens/dotfiles/issues/517
sudo nvram SystemAudioVolume=%00 did finally work for me, but only the first time I reboot after running it. Then, the value is restored back to [and the chime comes back thereafter. My laptop is MacBook Pro 2012.
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