From 2e23ded5c400a9b398ae07e70a5b443c4dc1ba6c Mon Sep 17 00:00:00 2001
From: "Rodney W. Grimes" <rgrimes@FreeBSD.org>
Date: Thu, 5 Apr 2018 15:00:08 +0000
Subject: [PATCH] Exit with usage when extra arguments are on command line
 preventing mistakes such as "halt 0p" for "halt -p". Approved by:	bde
 (mentor), phk (mentor) MFC after:	1 week

---
 sbin/reboot/reboot.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sbin/reboot/reboot.c b/sbin/reboot/reboot.c
index 87abb651744..28b84ff25bc 100644
--- a/sbin/reboot/reboot.c
+++ b/sbin/reboot/reboot.c
@@ -116,6 +116,8 @@ main(int argc, char *argv[])
 		}
 	argc -= optind;
 	argv += optind;
+	if (argc != 0)
+		usage();
 
 	if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 		errx(1, "cannot dump (-d) when halting; must reboot instead");