tcpclient(1)                                                  General Commands Manual                                                 tcpclient(1)

NAME

       tcpclient - create an outgoing TCP connection

SYNOPSIS

       tcpclient [ -46hHrRdDqQv ] [ -ilocalip ] [ -plocalport ] [ -Ttimeoutconn ] [ -llocalname ] [ -ttimeoutinfo ] [ -Iinterface ] host port pro-
       gram [ 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)