RGBcat

RGBcat is a little software that prints a text file with rainbow color. It’s similar to lolcat but less sophisticated and faster™.

Grab the source code here. Or get a pre-compiled x86_64 glibc Linux binary (md5: a1ffe12f4dffa538bccc91de519a02ac).

Also yeah I can’t do math and stuff so the source code is stupid—but hey it works I guess.