TLDR
Enter a command. For example: scutil, afplay, fdesetup, ocspd.

nvram

 
Manipulate firmware variables. More information: https://ss64.com/osx/nvram.html.
 
  • [p]rint all the variables stored in the NVRAM:
     
    nvram -p
     
  • [p]rint all the variables stored in the NVRAM using [x]ML format:
     
    nvram -xp
     
  • Modify the value of a firmware variable:
     
    sudo nvram {{name}}="{{value}}"
     
  • [d]elete a firmware variable:
     
    sudo nvram -d {{name}}
     
  • [c]lear all the firmware variables:
     
    sudo nvram -c
     
  • Set a firmware variable from a specific [x]ML [f]ile:
     
    sudo nvram -xf {{path/to/file.xml}}

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