It is once per second, not every 10 seconds.

[tcpdump] / tcpdump.1.in

diff --git a/tcpdump.1.in b/tcpdump.1.in
index eb0599e542a222829b7ddaf0285aa79d4ee34a9c..51beccb847671dedf9bf377265c4b33f07985ad4 100644 (file)
--- a/tcpdump.1.in
+++ b/tcpdump.1.in
@@ -728,7 +728,7 @@ IP and ICMP header checksum.
 .IP
 When writing to a file with the
 .B \-w
-option, report, every 10 seconds, the number of packets captured.
+option, report, once per second, the number of packets captured.
 .TP
 .B \-vv
 Even more verbose output.