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Man Pages


Manual Reference Pages  -  TCPCLIENT (1)

NAME

tcpclient - creates an outgoing TCP connection.

CONTENTS

Synopsis
Description
Options
See Also

SYNOPSIS

tcpclient [ opts ] host port prog

DESCRIPTION

opts is a series of getopt-style options. host is one argument. port is one argument. prog consists of one or more arguments.

tcpclient attempts to connect to a TCP server. If it is successful, it runs prog, with descriptor 6 reading from the network and descriptor 7 writing to the network. It also sets up several environment variables (see tcp-environ(5) ).

The server’s address is given by host and port. port may be a name from /etc/services or a number. host may be 0, referring to the local machine, or a dotted-decimal IP address, or a host name; it is fed through qualification using dns_ip4_qualify.

If the server has several IP addresses, tcpclient tries each address in turn.

OPTIONS

General options:
-q Quiet. Do not print error messages.
-Q (Default.) Print error messages.
-v Verbose. Print error messages and status messages.
Connection options:
-T x+y Give up on the connection attempt after x+y seconds. Default: 2+58. When a host has several IP addresses, tcpclient tries to connect to the first IP address, waits x seconds, tries to connect to the second IP address, waits x seconds, etc.; then it retries each address that timed out, waiting y seconds per address. You may omit +y to skip the second try. Before version 0.88, tcpclient(1) will use only x (default: 60).
-i localip
  Use localip as the IP address for the local side of the connection; quit if localip is not available. Normally tcpclient lets the operating system choose an address.
-p localport
  Use localport as the TCP port for the local side of the connection; quit if localport is not available. Normally tcpclient lets the operating system choose a port.
-d Delay sending data for a fraction of a second whenever the remote host is responding slowly. This is currently the default, but it may not be in the future; if you want it, set it explicitly.
-D Never delay sending data; enable TCP_NODELAY.
Data-gathering options:
-h (Default.) Look up the remote host name in DNS to set the environment variable $TCPREMOTEHOST.
-H Do not look up the remote host name in DNS; remove the environment variable $TCPREMOTEHOST.
-l localname
  Do not look up the local host name in DNS; use localname for the environment variable $TCPLOCALHOST. A common choice for localname is 0.
-r (Default.) Attempt to obtain $TCPREMOTEINFO from the remote host.
-R Do not attempt to obtain $TCPREMOTEINFO from the remote host.
-t n Give up on the $TCPREMOTEINFO connection attempt after n seconds. Default: 26.

SEE ALSO

tcpserver(1), tcprules(1), tcprulescheck(1), argv0(1), fixcrio(1), recordio(1), rblsmtpd(1), who@(1), date@(1), finger@(1), http@(1), tcpcat(1), mconnect(1), tcp-environ(5)

http://cr.yp.to/ucspi-tcp.html

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