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           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


           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 '''') 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.


           -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 mak-
                  ing 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 stan-
                  dard input, standard output, and  standard  error  channels  are
                  connected 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.
                  Socket prints its version ID and terminates.  This must  be  the
                  first argument to have an effect.


           The command
                  socket -v nntp
           connects   to   the   nntp  port  (port  119)  of
           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
           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 con-
           dition at the standard output of the program  occurs.  Then a new  con-
           nection is accepted.


           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,
           A non-zero exit code is returned if socket terminates due to  an  error
           condition or a signal.


           ip(7),  tcp(7),  unix(7),  accept(2),  bind(2),  listen(2), connect(2),
           socket(2), gethostbyname(3), getservbyname(3)


           socket -p terminates due to a SIGPIPE signal when there  is  more  data
           from the socket available than the executed program wants to read.

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