ROT13 is a very simple encryption algorithm that rotates the alphabet by 13 places. In other words, A becomes N and M becomes Z. Obviously it’s pretty useless as a secure cipher, but it’s great for covering up something in a posting that a reader might not want to see, such as the murderers name in a “who done it”.
In Linux, rot13 can easily be done using the following alias:
alias rot13=”tr A-Za-z N-ZA-Mn-za-m”