Secret easter eggs in Linux software.

There are a few Linux easter eggs out there.

VIM Douglas Adams quote.
VIM Douglas Adams quote.

The above screenshot shows the Douglas Adams quote in VIM. Type :42 in the command mode to get this quote.

The apt-command for Ubuntu, Debian and Mint has had an embedded easter egg for quite a while.

If you type the help command for apt-get, you will get a hint:

apt-get help
 
. . .
. . .
  -c=? Read this configuration file
  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp
See the apt-get(8), sources.list(5) and apt.conf(5) manual
pages for more information and options.
                       This APT has Super Cow Powers.

Type this command to see a cool cowsay styled message.

[jason@darknet:~/Videos] apt-get moo
                 (__) 
                 (oo) 
           /------\/ 
          / |    ||   
         *  /\---/\ 
            ~~   ~~   
..."Have you mooed today?"...

Aptitude also has a cool easter egg…

ubuntu ~ $ aptitude -vvvvv moo
All right, you win.
 
                               /----\
                       -------/      \
                      /               \
                     /                |
   -----------------/                  --------\
   ----------------------------------------------

There is a cool easter egg in the nmap command, this prints the output as l33t script kiddie style.

ubuntu ~ $ nmap -6 -oS - ::1
 
$tarting Nmap 6.40 ( httP://nmap.0rg ) at 2016-04-20 03:32 utc
Nmap $can r3port for IP6-LocAlh0$t (::1)
H0ST |z up (0.00023s Lat3ncy).
N0T $hOwn: 998 CL0sed pORt$
P0RT   $TATe $eRv!C3
22/TCP OpeN  s$h
80/Tcp opEn  http
 
Nmap dOne: 1 !P adDrE$z (1 h0$t Up) $cAnnED in 0.05 sEcOnDs

fortune stegosaurus.

ubuntu ~ $ fortune | cowsay -f stegosaurus
 _________________________________________
/ Knucklehead: "Knock, knock" Pee Wee:    \
| "Who's there?" Knucklehead: "Little ol' |
| lady." Pee Wee: "Liddle ol' lady who?"  |
| Knucklehead: "I didn't know you could   |
\ yodel"                                  /
 -----------------------------------------
\                             .       .
 \                           / `.   .' "
  \                  .---.  <    > <    >  .---.
   \                 |    \  \ - ~ ~ - /  /    |
         _____          ..-~             ~-..-~
        |     |   \~~~\.'                    `./~~~/
       ---------   \__/                        \__/
      .'  O    \     /               /       \  "
     (_____,    `._.'               |         }  \/~~~/
      `----.          /       }     |        /    \__/
            `-.      |       /      |       /      `. ,~~|
                ~-.__|      /_ - ~ ^|      /- _      `..-'
                     |     /        |     /     ~-.     `-. _  _  _
                     |_____|        |_____|         ~ - . _ _ _ _ _>

Make a train roll across your screen.

ubuntu ~ $ sl

Another secret easter egg in VIM.

Type: :Ni! in the VIM command mode to get this easter egg.

A shrubbery.
A shrubbery.

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