The command apt-get is very well-known. It is a handy programme installation/management tool in e.g. Ubuntu. If you give a single parameter “moo” to the apt-get, you will have an interesting easter egg.
root@helloacm.com:/home# apt-get moo
(__)
(oo)
/------\/
/ | ||
* /\---/\
~~ ~~
..."Have you mooed today?"...

easter-egg-apt-get-moo-linux
Working in Linux shell is fun. For Linux distribution such as CentOS use yum which is similar to apt-get, not sure you will get the same egg using yum moo!
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