cowsay

   1 apt install cowsay

Show files

   1 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
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

Daemon example

   1 cowsay -f daemon Hello world

 _____________
< Hello world >
 -------------
   \         ,        ,
    \       /(        )`
     \      \ \___   / |
            /- _  `-/  '
           (/\/ \ \   /\
           / /   | `    \
           O O   ) /    |
           `-^--'`<     '
          (_.)  _  )   /
           `.___/`    /
             `-----' /
<----.     __ / __   \
<----|====O)))==) \) /====
<----'    `--' `.__,' \
             |        |
              \       /
        ______( (_  / \______
      ,'  ,-----'   |        \
      `--{__________)        \/