Why are some commands not available when I mount a partition to /mnt in rescue mode under Red Hat Enterprise Linux?

Updated -

Release Found

Red Hat Enterprise Linux 5

Problem

When the directory /mnt is mounted by a disk partition or an NFS share in rescue mode, many commands such as ls, mount, umount, chroot and so on become unavailable. Invoking any of these commands results in the error message "command no...

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