Cowsay
cowsay is a program that generates ASCII art pictures of a cow with a message. It can also generate pictures using pre-made images of other animals, such as Tux the Penguin, the Linux mascot. It is written in Perl. There is also a related program called, with cows with thought bubbles rather than speech bubbles.
.cow files for cowsay exist which are able to produce different variants of cows, with different kinds of eyes, and so forth. It is sometimes used on IRC, desktop screenshots, and in software documentation. It is more or less a joke within hacker culture, but has been around long enough that its use is rather widespread. In 2007, it was highlighted as a Debian package of the day.Example
The Unix command can also be piped into the command:$ fortune | cowsay
________________________________________
/ You have Egyptian flu: you're going to \
\ be a mummy. /
----------------------------------------
\ ^__^
\ \_______
\/\
||----w |
|| ||
Using the parameter followed by, one can replace the cow with other beings, such as Tux, the Linux mascot:
$ fortune | cowsay -f tux
_________________________________________
/ You are only young once, but you can \
\ stay immature indefinitely. /
-----------------------------------------
\
\
.--.
|o_o |
|:_/ |
// \ \
/'\_ _/`\
\___)=(___/
Using the parameter shows all available cow files:
$ cowsay -l
Cow files in /usr/share/cowsay/cows:
apt bud-frogs bunny calvin cheese cock cower daemon default dragon
dragon-and-cow duck elephant elephant-in-snake eyes flaming-sheep fox
ghostbusters gnu hellokitty kangaroo kiss koala kosh luke-koala
mech-and-cow milk moofasa moose pony pony-smaller ren sheep skeleton
snowman stegosaurus stimpy suse three-eyes turkey turtle tux unipony
unipony-smaller vader vader-koala www