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#!/bin/awk -f
BEGIN {
	if (ARGC != 3) {
		print "usage: snap.missing source destination"
		exit 2
	}

	while ("snap.list " ARGV[1] "/" | getline) {
		snapshots[$0] = 1
	}

	while ("snap.list " ARGV[2] "/" | getline) {
		snapshots[$0] = 0
	}

	for (ts in snapshots) {
		if (snapshots[ts]) print ts
	}
}