This command is responsible for manipulating the color of the onboard RGB LED (on supported hardware). You can specify a hex color code or a pre-programmed pattern.

led -s <#hexcode>/-p <pattern>

Argument	Required/Optional	Description
-s	Optional	Specify a color hex code
-p	Optional	Specify a pre-programmed pattern

Set the LED color to hex code 8F00FF: led -s #8F00FF
Set the LED pattern to rainbow: led -p rainbow

Color codes can be found here