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try this
# comm -32 <(awk '!/^#/{print $2}' /etc/fstab|sort) <(mount|awk '{print $3}' |sort -u)

Try: comm -23 <(awk '{print $2}' /etc/fstab | sort) <(mount | awk '{print $3}' | sort)
It will incorrectly show swap partition as unmounted, as it is not present in mount command output.