From 1ada7db47ea8f19e0fef96fa06dd66a7954c3611 Mon Sep 17 00:00:00 2001
From: guenther <guenther@openbsd.org>
Date: Tue, 2 Jan 2018 06:56:41 +0000
Subject: [PATCH] When invoked with no file arguments, display usage and fail
 instead of silently doing nothing.

suggested by Klemens Nanni (kl3 (at) posteo.org), from FreeBSD r92772
ok millert@
---
 usr.bin/paste/paste.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/usr.bin/paste/paste.c b/usr.bin/paste/paste.c
index 4b00413e5bb..fd51bfa0a4c 100644
--- a/usr.bin/paste/paste.c
+++ b/usr.bin/paste/paste.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: paste.c,v 1.22 2015/12/09 19:39:10 mmcc Exp $	*/
+/*	$OpenBSD: paste.c,v 1.23 2018/01/02 06:56:41 guenther Exp $	*/
 
 /*
  * Copyright (c) 1989 The Regents of the University of California.
@@ -77,6 +77,9 @@ main(int argc, char *argv[])
 	argc -= optind;
 	argv += optind;
 
+	if (argc == 0)
+		usage();
+
 	if (!delim) {
 		delimcnt = 1;
 		delim = "\t";
-- 
2.20.1