--- a/mydump	Wed Jan 08 11:24:12 2014 +0100
+++ b/mydump	Wed Jan 08 11:27:44 2014 +0100
@@ -10,6 +10,7 @@
 	[[ "$db" =~ '+' ]] && continue
 
 	# dump the rest
-	mysqldump --events --opt "$db" | xz > $DIR/$db.sql.xz.tmp \
-	    && mv $DIR/$db.xz.tmp $DIR/$db.xz
+	out=$DIR/$db.sql.xz
+	mysqldump --events --opt "$db" | xz > $out.tmp \
+	    && mv $out.tmp $out
 done