Date: 2011apr5 OS: Linux Q. Can a shell script do rot13 "encryption" ? A. Yes, like this:

#!/bin/sh exec tr 'a-zA-Z' 'n-za-mN-ZA-M'

Save it as /usr/local/bin/rot13 and do:

chmod a+x /usr/local/bin/rot13

Use it like this:

echo hello | rot13