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Yum will do that by default in Live mode; anything you install whilst running off a live optical disc is installed to RAM because you are running off of RAM as it is. If you want to do it explicitly, though, you can create a RAM disk: mkdir foo mount -t tmpfs -o size=4096M bar /foo where: mount is the command. -t tmpfs specifies the type of filesystem. ...


Have you tried just using su? Most of the time the default user on a livecd has passwordless sudo, and can also su passwordlessly to any other user.

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