Don't worry! It's only stuff...

#!/bin/bash
 
change_rights() {
	for i in $(find $1 -perm 700); do
		echo "set rights for $i"
		chmod a+rw $i
	done
 
	for i in $(find $1 -perm 600); do
		echo "set rights for $i"
		chmod a+rw $i
	done
}
 
change_name() {
	for i in $(find $1 -name "*.JPG"); do
		echo "rename $i ${i//.JPG/.jpg}"
		mv "$i" "${i//.JPG/.jpg}"
	done
}
 
for DIR in /data/bilder/300dpi /data/bilder/700dpi; do
	change_rights $DIR
	change_name $DIR
done