This is a widespread tip but it was missing from Tips4Linux.com
If you want to mount an ISO image using the Terminal you can use
sudo mount -o loop image_file.iso /path/to/mount/folder
Mount ISO images in Linux using the command line
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Note that this will mount the ISO image read only. If you need to mess with the contents of the image you will need to apply a few tricks as explained here: Mount an ISO image in Linux.