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archive.rc: avoid dependency on tac(1)

--- a/sdrip/archive.rc

+++ b/sdrip/archive.rc

@@ -13,9 +13,14 @@

 	year=substr($1, 1, 4)

 	month=substr($1, 5, 2)

 	dirs[sprintf("%s/%s", year, month)] = 1

-	printf "mv -n %s %s/img/%s/%s/%s\n", $0, ENVIRON["HOME"], year, month, $0

+	mvs[$0] = sprintf("%s/img/%s/%s/%s", ENVIRON["HOME"], year, month, $0)

 }

 END{

+	printf "flag e +\n"

 	for(d in dirs)

 		printf "mkdir -p %s/img/%s\n", ENVIRON["HOME"], d

-}' | tac | sh

+	for(k in mvs)

+		printf "mv %s %s\n", k, mvs[k]

+	printf "exit 0\n"

+	exit(0)

+}' | rc