#!/bin/bash
nr=1
if [ "$1" == "" ]
  then 
    name="Bild"
  else
    name=$1
fi        
for img in `ls *.JPG` `ls *.jpg` `ls *.jpeg`
do
  num=$(printf '%03d' $nr)
  jhead -nf'%Y.%m.%d_%H%M_'$name'_'$num $img
  img=$(echo $img | cut -b -8)
  nr=`expr $nr + 1`
done