src/usr.bin/nc/nc.1 - diff

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Diff for /src/usr.bin/nc/nc.1 between version 1.38 and 1.39

version 1.38, 2005/05/20 10:55:09

version 1.39, 2005/07/17 19:15:38

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in response to commands issued by the client.

For example, to retrieve the home page of a web site:

.Pp

.Dl $ echo \&"GET\&" | nc host.example.com 80

.Dl $ echo -n \&"GET / HTTP/1.0\er\en\er\en\&" | nc host.example.com 80

.Pp

Note that this also displays the headers sent by the web server.

They can be filtered, using a tool such as

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.Fl z

flag can be used to tell

.Nm

not to initiate a connection,

to report open ports,

together with the

rather than initiate a connection.

.Fl v

.Pq verbose

flag,

to report open ports.

For example:

.Bd -literal -offset indent

$ nc -vz host.example.com 20-30

$ nc -z host.example.com 20-30

Connection to host.example.com 22 port [tcp/ssh] succeeded!

Connection to host.example.com 25 port [tcp/smtp] succeeded!

.Ed

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.Pp

.Dl $ nc -s 10.1.2.3 host.example.com 42

.Pp

Send UDP packets to ports 20-30 of host.example.com, and report which ones

responded with an ICMP packet after three seconds:

.Pp

.Dl $ nc -uvz -w 3 host.example.com 20-30

.Pp

Create and listen on a Unix Domain Socket:

.Pp

.Dl $ nc -lU /var/tmp/dsocket

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.br

Rewritten with IPv6 support by

.An Eric Jackson Aq ericj@monkey.org .

.Sh CAVEATS

UDP port scans will always succeed

(i.e. report the port as open),

rendering the

.Fl uz

combination of flags relatively useless.