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}}