I stole this from the internet

imagemagick brew install imagemagick

gifsicle brew install gifsicle

I've only tried this on a mac

usage: yolo.sh [options] <message>

-h Show this help message

-o <output.gif> Path to output gif. Default: yolo.gif

-c <color> Choose color set, valid options are: red, orange, yellow, green, blue, purple, pink, black, white. Default: blue

-w Force white text color

sh yolo.sh -o test.gif -c blue hello

creates a scrolly blue text that says "hello" in a file called test.gif in /output