device mapper alias resolver

iostat-lvm-swap.sh

#!/bin/bash
for line in $(iostat $(dmsetup ls | sed -n '/swap/{ s/.*, //; s/)//; s/^/dm-/; p; }') | sed 's/\s\+/,/g'); do
	if (echo $line | grep ^dm- >/dev/null 2>&1); then
		dm=$(echo $line | cut -d, -f1 | cut -d- -f2);
		dname=$(dmsetup info -c --noheadings -j 253 -m $dm | cut -d: -f1);
		echo $line |
			sed "s/^dm-$dm/$dname/; s/,/\t\t/g;";
	else 
		echo "$line" | sed 's/,/\t\t/g;';
	fi
done