Add missing and probably also mandatory -h option.

MFC after:	1 week

2 files changed, 5 insertions, 1 deletions

diff --git a/usr.sbin/usbdump/usbdump.8 b/usr.sbin/usbdump/usbdump.8
index eec13b8..05ff3f9 100644
--- a/usr.sbin/usbdump/usbdump.8
+++ b/usr.sbin/usbdump/usbdump.8
@@ -40,6 +40,7 @@
 .Op Fl w Ar file
 .Op Fl f Ar filter
 .Op Fl b Ar file
+.Op Fl h
 .Sh DESCRIPTION
 The
 .Nm
@@ -79,6 +80,8 @@ If 128 is added to the endpoint number that means IN direction, else OUT directi
 A device unit or endpoint value of -1 means ignore this field.
 If no filters are specified, all packets are passed through using the default -1,-1 filter.
 This option can be specified multiple times.
+.It Fl h
+This option displays a summary of the command line options.
 .El
 .Sh EXAMPLES
 Capture the USB raw packets on usbus2:
diff --git a/usr.sbin/usbdump/usbdump.c b/usr.sbin/usbdump/usbdump.c
index c26d831..1e8d171 100644
--- a/usr.sbin/usbdump/usbdump.c
+++ b/usr.sbin/usbdump/usbdump.c
@@ -775,6 +775,7 @@ usage(void)
 	fprintf(stderr, FMT, "-v", "Increase the verbose level");
 	fprintf(stderr, FMT, "-b <file>", "Save raw version of all recorded data to file");
 	fprintf(stderr, FMT, "-w <file>", "Write the raw packets to file");
+	fprintf(stderr, FMT, "-h", "Display summary of command line options");
 #undef FMT
 	exit(EX_USAGE);
 }
@@ -797,7 +798,7 @@ main(int argc, char *argv[])
 	const char *optstring;
 	char *pp;
 
-	optstring = "b:i:r:s:vw:f:";
+	optstring = "b:hi:r:s:vw:f:";
 	while ((o = getopt(argc, argv, optstring)) != -1) {
 		switch (o) {
 		case 'i':