#!/bin/sh
decalage=$1; shift
decalage=`expr 0$decalage % 26 + 1`
inputm=abcdefghijklmnopqrstuvwxyz
inputM=ABCDEFGHIJKLMNOPQRSTUVWXYZ
outputm=$inputm$inputm
outputm=`echo $outputm|cut -c$decalage-`
outputm=`echo $outputm|cut -c-26`
outputM=$inputM$inputM
outputM=`echo $outputM|cut -c$decalage-`
outputM=`echo $outputM|cut -c-26`
echo $inputm$inputM
echo $outputm$outputM
cat "$@" | tr $inputm$inputM $outputm$outputM