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+.\"
+.\" Copyright (c) 2010 Weongyo Jeong.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 14, 2010
+.Dt usbdump 8
+.Os
+.Sh NAME
+.Nm usbdump
+.Nd "dump traffic on USB host controller"
+.Sh SYNOPSIS
+.Nm
+.Op Fl i Ar ifname
+.Op Fl r Ar file
+.Op Fl s Ar snaplen
+.Op Fl v
+.Op Fl w Ar file
+.Sh DESCRIPTION
+The
+.Nm
+utility provides a way to dump USB packets on each host controller.
+.Pp
+The following options are accepted.
+.Bl -tag -width ".Fl f Ar file"
+.It Fl i Ar ifname
+Listen on USB bus interface.
+.It Fl r Ar file
+Read the raw packets from file.
+.It Fl s Ar snaplen
+Snapshot bytes from each packet.
+.It Fl v
+Enable debugging messages.
+When it defined multiple times the verbose level increases.
+.It Fl w Ar file
+Write the raw packets to file.
+.El
+.Sh EXAMPLES
+Captures the USB raw packets alive on usbus2:
+.Pp
+.Dl "usbdump -i usbus2 -s 256 -v"
+.Pp
+Dumps the USB raw packets of usbus2 into the file without packet
+size limit:
+.Pp
+.Dl "usbdump -i usbus2 -s 0 -w /tmp/dump_pkts"
+.Pp
+Read the USB raw packets from the file:
+.Pp
+.Dl "usbdump -r /tmp/dump_pkts -v"
+.Sh SEE ALSO
+.Xr usbconfig 8
+.Sh AUTHORS
+.An Weongyo Jeong
+.Aq weongyo@FreeBSD.org .