Provided by: ucspi-tcp-ipv6_0.88-3_amd64 
NAME
tcpclient - create an outgoing TCP connection
SYNOPSIS
tcpclient [ -46hHrRdDqQv ] [ -ilocalip ] [ -plocalport ] [ -Ttimeoutconn ] [ -llocalname ] [
-ttimeoutinfo ] [ -Iinterface ] host port program [ arg ... ]
DESCRIPTION
tcpclient attempts to connect to a TCP server. If it is successful, it runs program with the given
arguments, with descriptor 6 reading from the network and descriptor 7 writing to the network.
The server's address is given by host and port. host may be 0, referring to the local machine, or a
dotted-decimal IP address, or a host name; if a host has several IP addresses, tcpclient tries each in
turn. port may be a numeric port number or a port name.
tcpclient sets up several environment variables, as described in tcp-environ(5).
OPTIONS
-ilocalip
Use localip as the IP address for the local side of the connection; quit if localip is not
available.
-plocalport
Use localport as the port number for the local side of the connection; quit if localport is not
available.
-Iinterface
Use interface as the local network interface. This is only defined for IPv6 sockets and needed if
you use link-local IPv6 addresses.
-Ttimeoutconn
Give up on the connection attempt after timeoutconn seconds. Default: 60. This timeout applies to
each IP address tried.
-d (Default.) Delay sending data for a fraction of a second whenever the remote host is responding
slowly, to make better use of the network.
-D Never delay sending data; enable TCP_NODELAY. This is appropriate for interactive connections.
-q Quiet. Do not print any messages.
-Q (Default.) Print error messages.
-v Verbose. Print all available messages.
DATA-GATHERING OPTIONS
-h (Default.) Look up the remote host name for TCPREMOTEHOST.
-H Do not look up the remote host name; unset TCPREMOTEHOST.
-llocalname
Do not look up the local host name; use localname for TCPLOCALHOST.
-r (Default.) Attempt to obtain TCPREMOTEINFO from the remote host.
-R Do not attempt to obtain TCPREMOTEINFO from the remote host.
-ttimeoutinfo
Give up on the TCPREMOTEINFO connection attempt after timeoutinfo seconds. Default: 26.
-4 Fall back to IPv4 sockets. This is necessary for terminally broken systems like OpenBSD which
will not let IPv6 sockets connect to V4-mapped IPv6 addresses. Please note that this also applies
to DNS lookups, so you will have to use an DNS resolver with an IPv6 address to connect to IPv6
systems. Use DNSCACHEIP to set the DNS resolver IP dynamically.
-6 Force IPv6 mode in UCSPI environment variables, even for IPv4 connections. This will set $PROTO
to TCP6 and put IPv4-mapped IPv6 addresses in TCPLOCALIP and TCPREMOTEIP.
SEE ALSO
date@(1), finger@(1), http@(1), mconnect(1), tcpcat(1), tcpserver(1), who@(1), tcp-environ(5) tcpclient(1)