#!/bin/sh -
PATH=/bin:/usr/bin; export PATH

# rot13 - Usenet-standard, simple text encryption filter
# Steve Kinzler, steve@kinzler.com, Apr 93
# https://kinzler.com/me/home.html#unix

exec tr '[A-M][N-Z][a-m][n-z]' '[N-Z][A-M][n-z][a-m]'