#!/bin/sh
IFS=" \t\n"
PATH="/bin:/usr/bin"
umask 077
TDIR=${TDIR-/tmp}
TFILE=`mktemp -q "$TDIR/sicherer.XXXXXXXX"` || exit 1
for i in **/*.txt; do
	tr "A-Z" "a-z" < "$i" > "$TFILE"
	mv "$TFILE" "$i"
done