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You need to have fortune and cowsay installed. It uses a subshell to list cow files in you cow directory (this folder is default for debian based systems, others might use another folder).
you can add it to your .bashrc file to have it great you with something interesting every time you start a new session.
There is 1 alternative - vote for the best!
To install on centos 6.2
for Centos auto accept:
yum install fortune* -y
yum install cowsay* -y
Removed the -f command as I dont know how, but it works without it.
Almost the same but one folder higher =).
If you can do better, submit your command here.
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