#!/bin/bash

PAR=$1

while [ PAR -lt 0] let PAR=PAR+26
while [ PAR -bt 26] let PAR= PAR-26

<vstup> tr "A-Za-z" "$(echo -e-n \\x$[41+$PAR])-ZA-$(echo -e-n \\x$[40+$PAR])$(echo -e-n \\x$[61+$PAR])-za-$(echo -e-n \\x$[60+$PAR])