sec-pentesting-toolkit/Cryptography/Rotation-Ciphers/ROT_13_EASY.md

VAR=$(cat data.txt)
echo "$VAR"
alias rot13="tr A-Za-z N-ZA-Mn-za-m"
echo "$VAR" | rot13

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In Python we can use: "YRIRY GJB CNFFJBEQ EBGGRA".decode(encoding="ROT13") https://docs.python.org/2/library/codecs.html#codec-base-classes

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Online:

http://www.xarg.org/tools/caesar-cipher/