.SH "SYNOPSIS"
.
.B pathmtu
+.RB [ \-46v ]
.RB [ \-H
.IR header ]
.RB [ \-m
Writes a brief description of the command-line options available to
standard output and exits with status 0.
.TP
-.B "\-v, \-\-version"
+.B "\-V, \-\-version"
Writes tripe's version number to standard output and exits with status
0.
.TP
.B "\-u, \-\-usage"
Writes a brief usage summary to standard output and exits with status 0.
.TP
+.B "\-4"
+Look up hostnames only as IPv4 addresses.
+.TP
+.B "\-6"
+Look up hostnames only as IPv6 addresses.
+.TP
.BI "\-g, \-\-growth=" factor
Sets the retransmit interval growth factor. Each time a packet is
retransmitted,
.I did
receive the packet. The default timeout is 8 seconds.
.TP
+.B "\-v, \-\-verbose"
+Write a running human-readable commentary to standard error about the
+progress of the operation. Usually,
+.B pathmtu
+does its job silently unless there are errors.
+.TP
.BI "\-H, \-\-header=" header
Sets the packet header, in hexadecimal. If you set an explicit port
number, it may be worth setting the packet header too, so as not to