-.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.155 2004-01-07 22:50:40 guy Exp $ (LBL)
+.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.156 2004-01-15 19:53:49 guy Exp $ (LBL)
.\"
.\" $NetBSD: tcpdump.8,v 1.9 2003/03/31 00:18:17 perry Exp $
.\"
function.
.TP
.B \-v
-(Slightly more) verbose output.
+When parsing and printing, produce (slightly more) verbose output.
For example, the time to live,
identification, total length and options in an IP packet are printed.
Also enables additional packet integrity checks such as verifying the
IP and ICMP header checksum.
+When writing to a file with the
+.B \-w
+option, report, every 10 seconds, the number of packets captured.
.TP
.B \-vv
Even more verbose output.