#!/bin/sh

ROOT_UID=0      # Only users with $UID 0 have root privileges.
E_NOTROOT=67    # Non-root exit error.

# Run as root, of course.
if [ "$UID" -ne "$ROOT_UID" ]; then
  echo "Must be root to run this script."
  exit $E_NOTROOT
fi

mount /mnt/backup
ls -l /mnt/backup | (cat <<EOF
This is an automated report of $0 on the server `hostname -s`.

EOF
cat
) | /bin/mail -s "[ls -l /mnt/backup]" root
umount /mnt/backup