cowsay

Generate an ASCII character (by default a cow) saying or thinking something.

Print an ASCII cow saying "Hello world!":

cowsay "Hello world!"

List all available characters:

cowsay -l

Print an ASCII dragon saying "Hello!":

echo "Hello!" | cowsay -f dragon

Print a stoned thinking ASCII cow:

cowthink -s "I'm just a cow, not a great thinker ..."