/usr/bin/rot13 is in hxtools 20170430-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!/bin/sh
#
# do ROT13 substituion cipher
# written by Jan Engelhardt, 2013
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the WTF Public License version 2 or
# (at your option) any later version.
#
if [ "$#" -gt 1 ]; then
cat "$@" | tr 'A-Za-z' 'N-ZA-Mn-za-m';
elif [ "$#" -eq 1 ]; then
exec tr 'A-Za-z' 'N-ZA-Mn-za-m' <"$1";
else
exec tr 'A-Za-z' 'N-ZA-Mn-za-m';
fi;
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