You may display all of the available xkcd colors by passing the option -a or flag -all. Others: Monitor RGB output, RF TV video output, 2 cartridge slots, Atari Serial Input/Ouput (SIO) port, 4 controller jacks, 4 internal slots for memory.

It's probably easiest to create an alias in your shell's rc file (e.g., ~/.bashrc) such as alias mplcolors='python /path/to/dir/mplcolors.py' You just need a Python distribution with matplotlib. On Mac I suggest switching to a different terminal emulator with more modern support such as kitty or iTerm. Operating system and software agnostic - works with Windows, OSX, Linux and just about anything else Appears as a headless ghost display in the OS graphics. I'm not sure that that is a workaround for this. Notably, Mac's Terminal.app does not have this and so the colors cannot be properly displayed. This requires a terminal with true color support.

It can also print all of the built-in colorbars. Tired of searching 'matplotlib colors' every week/day/hour? This simple script displays them all conveniently right in your terminal emulator! This uses lors to get color names and RGB values and prints with ANSI escape sequences.

Mac rgb emulator