--- src/usr.bin/nc/netcat.c

+++ src/usr.bin/nc/netcat.c

@@ -126,6 +126,9 @@ main(int argc, char *argv[])

 	uport = NULL;

 	sv = NULL;

+	if (argc < 1)

+		usage(1);

+

 	while ((ch = getopt(argc, argv,

 	    "46DdhI:i:jklnO:P:p:rSs:tT:UuV:vw:X:x:z")) != -1) {

 		switch (ch) {

@@ -893,10 +896,10 @@ void

 usage(int ret)

 {

 	fprintf(stderr,

-	    "usage: nc [-46DdhklnrStUuvz] [-I length] [-i interval] [-O length]\n"

-	    "\t  [-P proxy_username] [-p source_port] [-s source_ip_address] [-T ToS]\n"

-	    "\t  [-V rtable] [-w timeout] [-X proxy_protocol]\n"

-	    "\t  [-x proxy_address[:port]] [hostname] [port]\n");

+	    "usage: netcat [-46DdhklnrStUuvz] [-I length] [-i interval] [-O length]\n"

+	    "              [-P proxy_username] [-p source_port] [-s source_ip_address] [-T ToS]\n"

+	    "              [-V rtable] [-w timeout] [-X proxy_protocol]\n"

+	    "              [-x proxy_address[:port]] [hostname] [port]\n");

 	if (ret)

 		exit(1);

 }