unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (OSF1-V5.1-alpha)
Page:
Section:
Apropos / Subsearch:
optional field



ct(1)									ct(1)



NAME

  ct - Dials an	attached terminal and issues a login process

SYNOPSIS

  ct [-hv] [-sspeed] [-wnumber]	[-xnumber] telephone_number

  The ct command enables a user	on a remote terminal to	communicate with the
  Tru64	UNIX operating system over a telephone line attached to	a modem	at
  each end of the connection.

OPTIONS

  -h  Prevents ct from hanging up the current line to answer an	incoming
      call.

  -sspeed
      Sets the data rate where speed is	expressed in baud.  The	default	is
      1200 baud.

  -v  Allows ct	to send	a running narrative to standard	error output.

  -wnumber
      Specifies	number as the maximum number of	minutes	that ct	is to wait
      for a line.  The command then dials the remote modem at 1-minute inter-
      vals until the connection	is established or the specified	time has
      elapsed.

  -xnumber
      Used for debugging.  Produces detailed information about the command's
      execution	on standard error output on the	local system. The debugging
      level, number, is	a single digit between 0 and 9.	 The recommended
      default is 9.

  telephone_number
      Specifies	the telephone number of	the modem attached to the remote ter-
      minal.  telephone_number can include the digits 0	- 9, - (dashes)
      representing delays, = (equal signs) representing	secondary dial tones,
      *	(asterisks), and # (number signs). The phone number can	contain	a
      maximum of 31 characters.

DESCRIPTION

  Once ct establishes a	connection, a user on the remote terminal can log in
  and work on the system.

  A user on the	local system issues ct with the	appropriate telephone number
  to call the modem attached to	the remote terminal. When the connection is
  established, ct issues a login prompt	that is	displayed on the remote	ter-
  minal.  A user on the	remote terminal	enters a username at the prompt, and
  the operating	system opens a new shell.  The person using the	remote termi-
  nal then proceeds to work on the system like a local user.

  However, if there are	no free	lines, the ct command displays a message to
  that effect and asks if the local user wants to wait for one.	 If the	reply
  is no, the ct	command	hangs up.  If the local	user wants to wait for a free
  line,	the ct command prompts for the number of minutes to wait.  The ct
  command continues to dial the	remote system at 1-minute intervals until the
  connection is	established or until the specified amount of time has
  elapsed.

  In order to establish	a ct connection, the remote user contacts the local
  user with a regular telephone	call and asks the local	user to	issue the ct
  command.  However, if	such connections occur regularly at your site, your
  system manager might prefer that a specified local system automatically
  issues the ct	command	to one or more specified terminals at certain desig-
  nated	times.

  The ct command is useful in the following situations:

    +  When a user working offsite needs to communicate	with a local system
       under strictly supervised conditions.  Because the local	system con-
       tacts the remote	terminal, the remote user does not need	to know	the
       telephone number	of the local system. Additionally, the local user
       issuing the ct command can monitor the work of the remote user.

    +  When the	cost of	the connection should be charged either	to the local
       site, or	to a specific account on the calling system.  If the remote
       user has	the appropriate	access permission and can make outgoing	calls
       on the attached modem, that user	can make the equivalent	of a collect
       call.  The remote user calls the	specified local	system,	logs in, and
       issues the phone	number of the remote terminal without the -h option.
       The local system	hangs up the initial link so that the remote terminal
       is free for an incoming call, and then calls back to the	modem
       attached	to the remote terminal.

  After	the user logs out, ct prompts the user on the remote terminal with a
  reconnect option; the	system can either display a new	login prompt or	drop
  the line.

  The ct command is not	as flexible as the cu command.	For example, you can-
  not issue system commands on the local system	while connected	to a remote
  system via ct.  However, the ct command does have two	features not avail-
  able with cu:

    +  You can instruct	ct to continue dialing the specified number until the
       connection is established or a set amount of time has elapsed.

    +  You can specify more than one telephone number at a time	to instruct
       ct to continue dialing each modem until a connection is established
       over one	of the lines.

  If you specify alternate dialing paths by entering more than one number on
  the command line, ct tries each line listed in the /usr/lib/uucp/Devices
  file until it	finds an available line	with appropriate attributes, or	runs
  out of entries.  If there are	no free	lines, ct asks if it should wait for
  one, and if so, for how many minutes.	 The ct	command	continues to try to
  open the dialers at 1-minute intervals until the specified time is
  exceeded.  The local user can	override this default by specifying a time
  with the -wnumber option when	entering the command.









NOTES

   1.  In order	to establish a ct connection, the remote user generally	con-
       tacts a local user (with	a regular phone	call) and asks the local user
       to issue	the command.

   2.  Before issuing the ct command, be certain that the remote terminal is
       attached	to a modem that	can answer the telephone.

EXAMPLES

   1.  To connect to a modem with an internal number 4-1589 (the - is
       optional), enter:
	    ct 41589

       The system responds:
	    Allocated dialer at	1200 baud
	    Confirm hang_up? (y	to hang_up)

   2.  To dial a modem,	with a local telephone number, attached	to a remote
       terminal	(dialing 9 for an outside line and specifying a	3-minute wait
       time), enter:
	    ct -w3 9=5551212

   3.  To dial a modem,	with a long-distance number, attached to a remote
       terminal	(specifying an outside line and	a five-minute wait), enter:
	    ct -w5 9=15555551212



FILES

  /usr/lib/uucp/Devices
      Information about	available devices.

  /usr/lib/uucp/Dialcodes
      Dialing code abbreviations.

  /usr/lib/uucp/Dialers
      Initial handshaking on a link.

  /usr/lib/uucp/Permissions
      Access permission	codes.

  /usr/lib/uucp/Systems
      Accessible remote	systems.

SEE ALSO

  Commands:  cu(1), login(1), tip(1), uucico(8), uucleanup(8), uucp(1),	uuen-
  code(1), uulog(1), uuname(1),	uupick(1), uusched(8), uusend(1), uustat(1),
  uuto(1), uux(1)