On Fri, 27 Feb 2009, Michael Adams wrote:

> Saw your sig- was tempted to try it on my Linux CLI, but chickened out
> because i don't understand it. Is it for linux or PHP or what?

Yes, it is off-topic :)

It is for standard Unix shells.

The shell pipes the echo'd argument to the Unix tr(1) tool which 
substitutes based on the first argument's set to the second argument 
set. Here are two references:

http://man.netbsd.org/cgi-bin/man-cgi?tr

http://www.ibm.com/developerworks/opensource/library/l-tiptex5.html

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