TCPCONNECT(1) General Commands Manual TCPCONNECT(1)NAME
tcpconnect - general TCP/IP client
SYNOPSIS
tcpconnect [-irv] [-l localaddr] host port
DESCRIPTION
tcpconnect creates a TCP/IP connection to a server running on the machine host, listening to port port. It then reads standard input and
sends to the remote server, and data received from the server is printed to standard output. When end-of-file is reached on both standard
input and the TCP/IP connection, tcpconnect terminates.
OPTIONS -i Terminate at end-of-file on standard input; don't wait for the server to close the connection.
-r Terminate when the remote server closes the connection; don't wait for end-of-file on standard input.
-v Verbose mode. Prints a message to standard error when the connection has been established.
-l addr:port
Bind the local end-point of the connection to IP address addr, TCP port port. Either the IP address or the port, but not both, may
be left out, meaning that the operating system gets to choose that part by itself.
SEE ALSO tcplisten(1), telnet(1), tcpbug(1).
BUGS
The names of the options are not yet finalized, and may change at a future release.
1997 April 13 TCPCONNECT(1)
Check Out this Related Man Page
SOCKET(1) General Commands Manual SOCKET(1)NAME
socket - create a TCP or a UNIX domain socket and connect to stdin/out
SYNOPSIS
socket [ -bcfqrvw ] [ -p command ] [ -B local address ] host port
socket [ -bcfqrvw ] [ -p command ] /path
socket [ -bcfqrvw ] [ -p command ] [ -B local address ] -s [ -l ] port
socket [ -bcfqrvw ] [ -p command ] -s [ -l ] /path
DESCRIPTION
Socket creates an Internet domain TCP or a UNIX domain stream socket and connects it to stdin and stdout. The host argument can be an
Internet number in dot-notation (like ``130.149.28.10'') or a domain name. In this case it must be possible to resolve the name to a valid
Internet address with gethostbyname(3). The port argument can be a port number or a service name which can be mapped to a port number by
getservbyname(3). If an UNIX domain socket is wanted to be created instead of an Internet socket, specify the path instead of an internet
(canonical domain named or dot-notated) host. The hostname is treated as a pathname if contains at least a single slash. I.e. if one wants
to create or connect to a socket in the current directory, use ./filename to specify the connection point.
OPTIONS -b (background)
The program forks itself into the background, detaches from its controlling tty, closes the file descriptors associated with the
tty, and changes its current directory to the root directory.
-B (local address)
This option specifies which local address to binded to when making a connection.
-c (crlf)
Linefeed characters (LF) are converted to a Carriage Return Linefeed sequence (CRLF) when written to the socket. CRLF sequences
read from the socket are converted to a single LF.
-f (fork)
When a server connection has been accepted, a separate process is forked to handle the connection in background.
-l (loop)
(only valid with -s) After a connection has been closed, another connection is accepted.
-p (program)
The specified command is executed for each connection. Its standard input, standard output, and standard error channels are con-
nected to the socket. Command can be any shell command since it is passed to /bin/sh.
-q (quit)
The connection is closed when an end-of-file condition occurs on standard input.
-r (read only)
No data is read from standard input and written to the socket.
-s (server)
A server socket is created. A hostname argument is not required of Internet sockets, only the port number but a pathname is
required for UNIX domain sockets.
-v (verbose)
Messages about connections etc. are issued to stderr.
-w (write only)
No data is read from the socket and written to the standard output.
-version
Socket prints its version ID and terminates. This must be the first argument to have an effect.
EXAMPLES
The command
socket -v coma.cs.tu-berlin.de nntp
connects to the nntp port (port 119) of coma.cs.tu-berlin.de (130.149.28.10).
The command
socket -sl 3425
creates a server socket on port 3425 on the local host and waits for a connection. After a connection has been closed, a new connection is
accepted.
The command
socket -wslqvp "echo Socket! " 1938
creates a server socket on port 1938 on the local host and waits for a connection. When a connection is accepted, the string "Socket!" is
written to the socket. No data is read from the socket and written to the finger program. The connection is closed when an end-of-file
condition at the standard output of the program occurs. Then a new connection is accepted.
DIAGNOSTICS
Lots of diagnostics for failed system calls.
unknown host host
host's address could not be resolved.
Signal signal caught, exiting
Socket exits on any signal other than SIGTSTP, SIGCONT, SIGCLD, SIGQUIT.
A non-zero exit code is returned if socket terminates due to an error condition or a signal.
SEE ALSO ip(7), tcp(7), unix(7), accept(2), bind(2), listen(2), connect(2), socket(2), gethostbyname(3), getservbyname(3)BUGS
socket -p terminates due to a SIGPIPE signal when there is more data from the socket available than the executed program wants to read.
Please report any other bugs to the author.
VERSION
This manual page describes Socket-1.1.
AUTHOR
Juergen Nickelsen <nickel@cs.tu-berlin.de>
Aug 6, 1992 SOCKET(1)