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Helpful answers
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Apr 11, 2013 6:05 PM in response to BlackValorby BobHarris,★HelpfulHave you tried the command WITHOUT 'sudo'?
nvram SystemAudioVolume%00'
While I do not know for sure, it is possible that the internet recovery environment is running as 'root' already. But like I said I do not know, and I have not booted into internet recovery to figure it out either.
Of course that also assumes the 'nvram' command exists in the internet recovery environment.
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Apr 11, 2013 6:08 PM in response to BobHarrisby BlackValor,I did try that as well. From my limited knowledge of unix commands, I don't believe 'nvram' is in at least the /usr directory and subs. It could be elsewhere but from using /ls in various folders I wasn't able to find it.
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Apr 11, 2013 6:17 PM in response to BlackValorby Frank Caggiano,★HelpfulGet yourself a small external disk and install a minimal OS X on it for use on occasions such as this one (and you will have more)
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Apr 11, 2013 8:26 PM in response to BlackValorby BobHarris,If there is no nvram command, it does not matter if there is no sudo or su command.
Frank's suggestion seems to be your best option.
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Apr 27, 2015 1:47 PM in response to BlackValorby atodorov,Hi guys,
it is possible to disable the startup sound in Internet recovery mode using
nvram SystemAudioVolume=%00 (you have to execute this command in the terminal).
I've tried it after wiping out OS X and installing Linux on my MacBook Air. For more info see here:
http://atodorov.org/blog/2015/04/27/disabling-macbook-startup-sound-in-linux/