mount

To temporarily allow executable scripts in /tmp to do their works:

mount -o remount,exec /tmp

To disable executable scripts in /tmp:

mount -o remount,noexec /tmp

Mounting an image:

mount -o loop -t iso9660 debian-sid.iso /mnt/isoimage/

Once an image is mounted to /mnt/isoimage, you can copy files inside that image to anywhere you like.