using rot13 and tr command for having an encrypted email address

Question

I have read many tutorials on the internet about the usage of the \'tr\' command. However, I am not able to understand how to encrypt an email address with a shell script sh

Answer 1

to simultaneously do ROT13 (for letters) and ROT5 (for numbers):

tr 'A-Za-z0-9' 'N-ZA-Mn-za-m5-90-4'

usage:

echo test | tr 'A-Za-z0-9' 'N-ZA-Mn-za-m5-90-4'

alias definition for your ~/.bashrc in case you need it more often:

alias rot="tr 'A-Za-z0-9' 'N-ZA-Mn-za-m5-90-4'"

(accurately rot135 or rot18)