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KIBITZ(1)		    General Commands Manual		     KIBITZ(1)

NAME
       kibitz -	allow two people to interact with one shell

SYNOPSIS
       kibitz [	kibitz-args ] user [ program program-args...  ]
       kibitz [	kibitz-args ] user@host	[ program program-args...  ]

INTRODUCTION
       kibitz  allows  two (or more) people to interact	with one shell (or any
       arbitrary program).  Uses include:

	      o	  A novice user	can ask	an expert user for help.   Using  kib-
		  itz,	the  expert  can see what the user is doing, and offer
		  advice or show how to	do it right.

	      o	  By running kibitz and	then starting  a  full-screen  editor,
		  people  may  carry out a conversation, retaining the ability
		  to scroll backwards, save the	entire conversation,  or  even
		  edit it while	in progress.

	      o	  People  can team up on games,	document editing, or other co-
		  operative tasks where	each person has	 strengths  and	 weak-
		  nesses that complement one another.

USAGE
       To  start  kibitz,  user1  runs kibitz with the argument	of the user to
       kibitz.	For example:

	    kibitz user2

       kibitz starts a new shell (or another program, if given on the  command
       line),  while  prompting	 user2 to run kibitz.  If user2	runs kibitz as
       directed, the keystrokes	of both	users become the input of  the	shell.
       Similarly, both users receive the output	from the shell.

       To terminate kibitz it suffices to terminate the	shell itself.  For ex-
       ample, if either	user types ^D (and the shell accepts this to be	 EOF),
       the shell terminates followed by	kibitz.

       Normally, all characters	are passed uninterpreted.  However, if the es-
       cape character (described when kibitz starts) is	issued,	the  user  may
       talk  directly to the kibitz interpreter.  Any Expect(1)	or Tcl(3) com-
       mands may be given.  Also, job control may be used while	in the	inter-
       preter, to, for example,	suspend	or restart kibitz.

       Various	processes  can	provide	various	effects.  For example, you can
       emulate a two-way write(1) session with the command:

	    kibitz user2 sleep 1000000

ARGUMENTS
       kibitz takes arguments, these should also be separated by whitespace.

       The -noproc flag	runs kibitz with no  process  underneath.   Characters
       are  passed  to the other kibitz.  This is particularly useful for con-
       necting multiple	interactive processes together.	 In this mode, charac-
       ters are	not echoed back	to the typist.

       -noescape disables the escape character.

       -escape	char  sets the escape character.  The default escape character
       is ^].

       -silent turns off informational messages	describing what	kibitz is  do-
       ing to initiate a connection.

       -tty ttyname defines the	tty to which the invitation should be sent.

       If  you	start  kibitz to user2 on a remote computer, kibitz performs a
       rlogin to the remote computer with  your	 current  username.  The  flag
       -proxy  username	 causes	 rlogin	 to  use username for the remote login
       (e.g. if	your account on	the remote computer has	a different username).
       If the -proxy flag is not given,	kibitz tries to	determine your current
       username	by (in that order) inspecting the environment  variables  USER
       and LOGNAME, then by using the commands whoami and logname.

       The  arguments  -noescape  and  -escape can also	be given by user2 when
       prompted	to run kibitz.

MORE THAN TWO USERS
       The current implementation of kibitz explicitly	understands  only  two
       users,  however,	 it  is	nonetheless possible to	have a three (or more)
       -way kibitz, by kibitzing another kibitz.  For example,	the  following
       command runs kibitz with	the current user, user2, and user3:

	    % kibitz user2 kibitz user3

       Additional  users  may  be added	by simply appending more "kibitz user"
       commands.

       The xkibitz script is similar to	kibitz but supports the	ability	to add
       additional users	(and drop them)	dynamically.

CAVEATS
       kibitz  assumes the 2nd user has	the same terminal type and size	as the
       1st user.  If this assumption is	incorrect, graphical programs may dis-
       play oddly.

       kibitz  handles	character graphics, but	cannot handle bitmapped	graph-
       ics.  Thus,

	    % xterm -e kibitz	 will work
	    % kibitz xterm	 will not work

       However,	you can	get the	effect of the latter command by	using  xkibitz
       (see  SEE  ALSO	below).	  kibitz  uses the same	permissions as used by
       rlogin, rsh, etc.  Thus,	you can	only kibitz  to	 users	at  hosts  for
       which  you can rlogin.  Similarly, kibitz will prompt for a password on
       the remote host if rlogin would.

       If you kibitz to	users at remote	hosts,	kibitz	needs  to  distinguish
       your  prompt from other things that may precede it during login.	 (Ide-
       ally, the end of	it is preferred	but any	part should suffice.)  If  you
       have  an	 unusual prompt, set the environment variable EXPECT_PROMPT to
       an egrep(1)-style regular expression.  Brackets should be preceded with
       one  backslash  in  ranges, and three backslashes for literal brackets.
       The default prompt r.e. is "($|%|#) ".

       kibitz requires the kibitz program on both hosts.  kibitz requires  ex-
       pect(1).

       By  comparison,	the  xkibitz script uses the X authorization mechanism
       for inter-host communication so it does not need	 to  login,  recognize
       your  prompt,  or  require  kibitz on the remote	host.  It does however
       need permission to access the other X servers.

BUGS
       An early	version	of Sun's tmpfs had a bug in it that causes  kibitz  to
       blow  up.   If  kibitz reports "error flushing ...: Is a	directory" ask
       Sun for patch #100174.

       If your Expect is not compiled with multiple-process support (i.e., you
       do not have a working select or poll), you will not be able to run kib-
       itz.

ENVIRONMENT
       The environment variable	SHELL is used to determine the shell to	start,
       if no other program is given on the command line.

       If the environment variable EXPECT_PROMPT exists, it is taken as	a reg-
       ular expression which matches the end of	your login  prompt  (but  does
       not otherwise occur while logging in). See also CAVEATS above.

       If the environment variables USER or LOGNAME are	defined, they are used
       to determine the	current	user name for a	kibitz to a  remote  computer.
       See description of the -proxy option in ARGUMENTS above.

SEE ALSO
       Tcl(3), libexpect(3), xkibitz(1)
       "Exploring  Expect: A Tcl-Based Toolkit for Automating Interactive Pro-
       grams" by Don Libes, O'Reilly and Associates, January 1995.
       "Kibitz - Connecting Multiple Interactive Programs  Together",  by  Don
       Libes,  Software	 - Practice & Experience, John Wiley & Sons, West Sus-
       sex, England, Vol. 23, No. 5, May, 1993.

AUTHOR
       Don Libes, National Institute of	Standards and Technology

       kibitz is in the	public domain.	NIST and I would appreciate credit  if
       this program or parts of	it are used.

				19 October 1994			     KIBITZ(1)

NAME | SYNOPSIS | INTRODUCTION | USAGE | ARGUMENTS | MORE THAN TWO USERS | CAVEATS | BUGS | ENVIRONMENT | SEE ALSO | AUTHOR

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