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I was having some issues with my mac so I reset NVRAM by holding ++P+R.

The problem is that this laptop does not chime when NVRAM is reset, so I'm not sure if NVRAM was indeed reset.

How can I find out whether NVRAM was reset?

Is there some terminal command that shows when NVRAM was last reset?

  • Laptop: 2017 MacBook Pro
  • OS:MacOS High Sierra
  • This page at OSXDaily has a wealth of NVRAM information. – IconDaemon Apr 23 at 14:53
  • It has ways of clearing nvram, but not ways for checking the status. – octavian Apr 23 at 15:01
  • If it reboots again, it cleared. I've never had a Mac laptop, so I don't know how obvious that is without a chime. – Tetsujin Apr 23 at 15:19
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Doesn't appear to be a direct way to do this. Part of the problem is that your changes to the NVRAM, if you were to clear it (nvram -c), will not take effect until after a reboot.

You could try this method which will perform a side-by-side diff of the contents of NVRAM prior to running a nvram -c.

For example:

$ sdiff <(nvram -xp) <(nvram -c &> /dev/null; nvram -xp) | less

If there's any changes you should see lines with vertical bars (|) which will denote lines that changed. Content on the left side will be your before and content on the right will be your after.

References

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