Not sure exactly how you want to use this, but here’s a basic example to get you started:
echo '[email protected]' | tr 'A-Za-z' 'N-ZA-Mn-za-m'
To make it easier, you can alias the tr command in your .bashrc file thusly:
alias rot13="tr 'A-Za-z' 'N-ZA-Mn-za-m'"
Now you can just call:
echo '[email protected]' | rot13
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