Although aptitude, the successor to apt-get does not have Super Cow powers (typing "aptitude --help" brings up a help screen that informs you of this at the end it does have an easter egg.
1.Type "aptitude moo" & press ENTER
aptitude responds with "There are no Easter Eggs in this program."
2.Type "aptitude -v moo" & press ENTER
This time, the response is "There really are no Easter Eggs in this program."
3."aptitude -v -v moo" causes it to respond with "Didn't I already tell you that there are no Easter Eggs in this program?"
4."aptitude -v -v -v moo" causes the response "Stop it!"
5.if you add a fourth -v ("aptitude -v -v -v -v moo" aptitude responds with "Okay, okay, if I give you an Easter Egg, will you go away?"
6.adding a fifth -v "aptitude -v -v -v -v -v moo") causes it to respond with "All right, you win.", followed by a crude, unrecognizable ASCII drawing.
7.putting the -v six or more times ("aptitude -v -v -v -v -v -v") answers the question of what the drawing is - "What is it? It's an elephant being eaten by a snake, of course."
8. this is a reference to Antoine de St. Exupery's "The Little Prince"
Fragaria
1.2. sudo apt-get moo