apt-moo

apt moo

apt moo is a classic APT easter egg that displays an ASCII art cow asking "Have you mooed today?". Both apt moo and apt-get moo produce the same cow.The "Super Cow Powers" reference is a separate joke: the line "This APT has Super Cow Powers." appears at the bottom of apt help and apt-get help output.

The moo easter egg has been part of APT since the early 2000s. It is an in-joke from the Debian culture of hiding playful features in software. The same cow is shown whether invoked via apt moo or apt-get moo.

apt(8), apt-get(8), cowsay(1)

Source code