lolcat
Put a rainbow in everything you cat to the console. tldr-pages
On several platforms
Several platforms
Print a file to the console in rainbow colors
lolcat path/to/fileIdentifyPrint the result of a text-producing command in rainbow colors
fortune | lolcatIdentifyUse a seed to generate consistent colors (default: 0 as in random)
lolcat --seed number path/to/fileIdentifyControl rainbow frequency (default: 0.1)
lolcat --frequency number path/to/fileIdentifyControl rainbow smoothing (default: 3)
lolcat --spread number path/to/fileIdentifyPrint a file to the console with animated rainbow colors
lolcat --animate path/to/fileIdentifyPrint a file to the console with 24-bit (truecolor) rainbow colors
lolcat --truecolor path/to/fileIdentify