X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/fc7b8aeb5e40fc50c68624e12069f5ba7bd9ae2c..refs/heads/tcpdump-4.6:/tcpdump.1.in

diff --git a/tcpdump.1.in b/tcpdump.1.in
index 3cceb468..a9664692 100644
--- a/tcpdump.1.in
+++ b/tcpdump.1.in
@@ -20,18 +20,21 @@
 .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 .\"
-.TH TCPDUMP 1  "6 May 2014"
+.TH TCPDUMP 1  "11 July 2014"
 .SH NAME
 tcpdump \- dump traffic on a network
 .SH SYNOPSIS
 .na
 .B tcpdump
 [
-.B \-AbdDefhHIJKlLnNOpqRStuUvxX
+.B \-AbdDefhHIJKlLnNOpqRStuUvxX#
 ] [
 .B \-B
 .I buffer_size
-] [
+]
+.br
+.ti +8
+[
 .B \-c
 .I count
 ]
@@ -123,8 +126,12 @@ tcpdump \- dump traffic on a network
 ]
 .ti +8
 [
+.BI \-\-time\-stamp\-precision= tstamp_precision
+]
+[
 .B \-\-version
 ]
+.ti +8
 [
 .I expression
 ]
@@ -433,13 +440,23 @@ time stamp type cannot be set for the interface, no time stamp types are
 listed.
 .TP
 .BI \-\-time\-stamp\-precision= tstamp_precision
-.PD
-Set the time stamp precision for the capture to
-\fItstamp_precision\fP. Currently supported are microseconds and
-nanoseconds. Note that availability of high precision time stamps (nanoseconds)
-and their actual accuracy is platform and HW dependent. Also note that when
-writing captures to the savefile, distinct magic number is used to distinguish
-savefiles which contains time stamps in nanoseconds.
+When capturing, set the time stamp precision for the capture to
+\fItstamp_precision\fP.  Note that availability of high precision time
+stamps (nanoseconds) and their actual accuracy is platform and hardware
+dependent.  Also note that when writing captures made with nanosecond
+accuracy to a savefile, the time stamps are written with nanosecond
+resolution, and the file is written with a different magic number, to
+indicate that the time stamps are in seconds and nanoseconds; not all
+programs that read pcap savefiles will be able to read those captures.
+.LP
+When reading a savefile, convert time stamps to the precision specified
+by \fItimestamp_precision\fP, and display them with that resolution.  If
+the precision specified is less than the precision of time stamps in the
+file, the conversion will lose precision.
+.LP
+The supported values for \fItimestamp_precision\fP are \fBmicro\fP for
+microsecond resolution and \fBnano\fP for nanosecond resolution.  The
+default is microsecond resolution.
 .TP
 .B \-K
 .PD 0
@@ -520,7 +537,11 @@ E.g.,
 if you give this flag then \fItcpdump\fP will print ``nic''
 instead of ``nic.ddn.mil''.
 .TP
+.B \-#
+.PD 0
+.TP
 .B \-\-number
+.PD
 Print an optional packet number at the beginning of the line.
 .TP
 .B \-O