nvram command not found When attempting to check the change the contents of the nvram (adding bootup chime, etc.), I am continually returned with the error: nvram: command not found. This occurs even when I attempt to just check the contents of the nvram, simply returning -bash: nvram: command not found. I can't seem to find anything addressing such a problem on 10.13.6. Thanks for any help you can offer.
The full path to it is:

/usr/sbin/nvram


Can you run that instead? Might be something wrong with your BASH environment that's preventing it from seeing the binary.