Mount 'em Up
ISO and IMG files content can be accessed quite easily in Linux. First you need to connect the iso / img files to your files system. Just as USB pen drives / memory sticks need to be connected before you can use them. For USB storage, this is normally done automatically by the operating system.
Connecting iso / img files is called mounting. The term comes from the early days of computing as a method for old mainframe computers to connect storage media. In order to attach the data storage, they were first mounted on the mainframe.
To mount iso or img files create a mount point in /mnt, then mount it:
mount -o loop ./various.iso /mnt/newiso
Now cd into the newly mounted iso: