#!/usr/local/plan9/bin/rc

fn sum {
	find . -type f | while (file = `{read}) {
		if (test -f $"file ) {
			sha256 $"file
		}
	}
}

previous = ''
sum | sed -E -e 's/(.*) = (.*)/\2 \1/' -e 's/SHA256 .//' -e 's/.$//' | sort | \
	tee sum | while (line = `{read}) {
#cat sum | while (line = `{read}) {
	sum = `{echo $line | sed -E -e 's/([^ ]*) (.*)/\1/'}
	file = `{echo $line | sed -E -e 's/([^ ]*) (.*)/\2/'}
	if (~ $sum $previous) {
		echo $"file is a duplicate.
	}
	
	previous = $sum
}