brightctl -- manage your screen brightness from CLI

syntax is {number}{optional %}{optional +-}

So:

• 5%+ adds 5% of max brightness to current brightness.
• 50 sets absolute value of 50.
• 50+ adds 50 to current brightness.
• 5% sets to 5% of max brightness.

Usage: brightctl [OPTIONS] [COMMAND]

Commands:
  i / info
  g / get
  m / max
  s / set
  help  Print this message or the help of the given subcommand(s)

Options:
  -l, --list
      --pretend
  -m, --machine-readable
  -n, --min-value <MIN_VALUE>  N{%}{+-} [default: 1]
  -d, --device <DEVICE>
  -c, --class <CLASS>
  -h, --help                   Print help
  -V, --version                Print version

Some udev rules are provided to be able to use this cli tool.