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tn3270(1) [bsd man page]

TN3270(1)						      General Commands Manual							 TN3270(1)

NAME

       tn3270 - full-screen remote login to IBM VM/CMS

SYNOPSIS

       tn3270 sysname

DESCRIPTION

       Tn3270  permits	a  full-screen,  full-duplex  connection from a VAX UNIX machine to an IBM machine running VM/CMS giving the appearance of
       being logged in directly to the remote machine on an IBM 3270 terminal.	Of course you must have an account on the  machine  to	which  you
       wish  to  connect  in  order  to  log  in.  Tn3270 looks to the user in many respects like the Yale ASCII Terminal Communication System II.
       Tn3270 is actually a modification of the Arpanet TELNET user interface (see telnet(1)) that  interprets	and  generates	raw  3270  control
       streams.

       Emulation  of the 3270 terminal is done in the Unix process.  This emulation involves mapping 3270-style commands from the host into appro-
       priate sequences to control the user's terminal screen.	Tn3270 uses curses(3x) and the /etc/termcap file to do this.  The  emulation  also
       involves  simulating  the  special 3270 keyboard keys (program function keys, etc.)  by mapping sequences of keystrokes from the ASCII key-
       board  into  appropriate  3270  control	strings.   This  mapping  is  terminal	dependent  and	is  specified  in  a   description   file,
       /usr/share/misc/map3270, (see map3270(5)) or in an environment variable MAP3270 (see mset(1)).  Any special function keys on the ASCII key-
       board are used whenever possible.  If an entry for the user's terminal is not found, tn3270 looks  for  an  entry  for  the  terminal  type
       unknown.  If this is not found, tn3270 uses a default keyboard mapping (see map3270(5)).

       The  first  character  of  each	special keyboard mapping sequence is either an ASCII escape (ESC), a control character, or an ASCII delete
       (DEL).  If the user types an unrecognized function key sequence, tn3270 sends an ASCII bell (BEL), or a	visual	bell  if  defined  in  the
       user's termcap entry, to the user's terminal and nothing is sent to the IBM host.

       If  tn3270  is invoked without specifying a remote host system name, it enters local command mode, indicated by the prompt ``tn3270>''.	In
       this mode, tn3270 accepts and executes the following commands:

	    open      connect to a remote host
	    close     close the current connection
	    quit      exit tn3270
	    z	      suspend tn3270
	    status    print connection status
	    ?	      print help information

       Other common telnet commands are not available in tn3270.  Tn3270 command mode may also be entered, after connecting to a host, by typing a
       special escape character (typically control-C).

       While  in command mode, any host login session is still alive but temporarily suspended.  The host login session may be resumed by entering
       an empty line (press the RETURN key) in response to the command prompt.	A session may be terminated by logging off the foreign host, or by
       typing ``quit'' or ``close'' while in local command mode.

FILES

       /etc/termcap
       /usr/share/misc/map3270

AUTHOR

       Greg Minshall

SEE ALSO

       mset(1),  telnet(1), termcap(3x), termcap(5), map3270(5), Yale ASCII Terminal Communication System II Program Description/Operator's Manual
       (IBM SB30-1911)

BUGS

       Performance is slow and uses system resources prodigiously.

       Not all 3270 functions are supported, nor all Yale enhancements.

4.3 Berkeley Distribution					 November 27, 1996							 TN3270(1)

Check Out this Related Man Page

RLOGIN(1C)																RLOGIN(1C)

NAME

       rlogin - remote login

SYNOPSIS

       rlogin rhost [ -ec ] [ -8 ] [ -L ] [ -l username ]
       rhost [ -ec ] [ -8 ] [ -L ] [ -l username ]

DESCRIPTION

       Rlogin connects your terminal on the current local host system lhost to the remote host system rhost.

       Each  host  has	a  file /etc/hosts.equiv which contains a list of rhost's with which it shares account names.  (The host names must be the
       standard names as described in rsh(1C).)  When you rlogin as the same user on an equivalent host, you don't need to give a password.   Each
       user may also have a private equivalence list in a file .rhosts in his login directory.	Each line in this file should contain an rhost and
       a username separated by a space, giving additional cases where logins without passwords are to be permitted.  If the  originating  user	is
       not  equivalent	to  the  remote  user, then a login and password will be prompted for on the remote machine as in login(1).  To avoid some
       security problems, the .rhosts file must be owned by either the remote user or root.

       The remote terminal type is the same as your local terminal type (as given in your environment TERM variable).  The terminal or window size
       is  also copied to the remote system if the server supports the option, and changes in size are reflected as well.  All echoing takes place
       at the remote site, so that (except for delays) the rlogin is transparent.  Flow control via ^S and ^Q and flushing of input and output	on
       interrupts  are	handled  properly.   The  optional argument -8 allows an eight-bit input data path at all times; otherwise parity bits are
       stripped except when the remote side's stop and start characters are other than ^S/^Q.  The argument -L allows the rlogin session to be run
       in  litout  mode.   A  line  of the form ``~.'' disconnects from the remote host, where ``~'' is the escape character.  Similarly, the line
       ``~^Z'' (where ^Z, control-Z, is the suspend character) will suspend the rlogin session.  Substitution  of  the	delayed-suspend  character
       (normally  ^Y)  for  the  suspend character suspends the send portion of the rlogin, but allows output from the remote system.  A different
       escape character may be specified by the -e option.  There is no space separating this option flag and the argument character.

SEE ALSO

       rsh(1C)

FILES

       /usr/hosts/*	   for rhost version of the command

BUGS

       More of the environment should be propagated.

4.2 Berkeley Distribution					   May 12, 1986 							RLOGIN(1C)
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