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cu(1)

SYNOPSIS

     tip [-nv] [-speed] [system-name]
     cu [-ehot] [-a acu] [-l line] [-s speed] [-#] [phone-number]

DESCRIPTION

     The tip and cu utilities establish a full-duplex connection to another
     machine, giving the appearance of being logged in directly on the remote
     CPU.  It goes without saying that you must have a login on the machine
     (or equivalent) to which you wish to connect.  The preferred interface is
     tip.  The cu interface is included for those people attached to the
     ``call UNIX'' command of Version 7 AT&T UNIX.  This manual page describes
     only tip.

     The options are as follows:

     -a acu    Set the acu.

     -l line   For cu, specify the line to use.  Either of the forms like
	       tty00 or /dev/tty00 are permitted.

     -n        No escape (disable tilde).

     -s speed  For cu, set the speed of the connection.  Defaults to 9600.

     -v        Set verbose mode.

     If speed is specified it will override any baudrate specified in the sys-
     tem description being used.

     If neither speed nor system-name are specified, system-name will be set
     to the value of the HOST environment variable.

     If speed is specified but system-name is not, system-name will be set to
     a value of ``tip'' with speed appended.  E.g., tip -1200 will set
     system-name to ``tip1200''.

     Typed characters are normally transmitted directly to the remote machine
     (which does the echoing as well).	A tilde (`~') appearing as the first
     character of a line is an escape signal; the following are recognized:

     ~^D or ~.
	     Drop the connection and exit (you may still be logged in on the
	     remote machine).

     ~c [name]
	     Change directory to name (no argument implies change to your home
	     directory).

     ~!      Escape to a shell (exiting the shell will return you to tip).

     ~>      Copy file from local to remote.  The tip utility prompts for the
	     name of a local file to transmit.

     ~<      Copy file from remote to local.  The tip utility prompts first
	     version of the ~> command.

     ~t from [to]
	     Take a file from a remote UNIX host.  As in the put command, the
	     to file defaults to the from file name if it is not specified.
	     The remote host executes the command string ``cat from; echo ^A''
	     to send the file to tip.

     ~|      Pipe the output from a remote command to a local UNIX process.
	     The command string sent to the local UNIX system is processed by
	     the shell.

     ~$      Pipe the output from a local UNIX process to the remote host.
	     The command string sent to the local UNIX system is processed by
	     the shell.

     ~C      Fork a child process on the local system to perform special pro-
	     tocols such as XMODEM.  The child program will be run with the
	     following somewhat unusual arrangement of file descriptors:

		   0 <-> local tty in
		   1 <-> local tty out
		   2 <-> local tty out
		   3 <-> remote tty in
		   4 <-> remote tty out

     ~#      Send a BREAK to the remote system.  For systems which do not sup-
	     port the necessary ioctl() call the break is simulated by a
	     sequence of line speed changes and DEL characters.

     ~s      Set a variable (see the discussion below).

     ~v      List all variables and their values (if set).

     ~^Z     Stop tip (only available with job control).

     ~^Y     Stop only the ``local side'' of tip (only available with job con-
	     trol); the ``remote side'' of tip, the side that displays output
	     from the remote host, is left running.

     ~?      Get a summary of the tilde escapes.

     To find the system description and thus the operating characteristics of
     system-name, tip searches for a system description with a name identical
     to system-name.  The search order is as follows:

	   1.	If the environment variable REMOTE does not start with a `/'
		it is assumed to be a system description, and is considered
		first.

	   2.	If the environment variable REMOTE begins with a `/' it is
		assumed to be a path to a remote(5) database, and the speci-
		fied database is searched.

	   3.	The default remote(5) database, /etc/remote, is searched.

     See remote(5) for full documentation on system descriptions.

     When tip prompts for an argument (e.g., during setup of a file transfer),
     the line typed may be edited with the standard erase and kill characters.
     A null line in response to a prompt, or an interrupt, will abort the dia-
     logue and return you to the remote machine.

     The tip utility guards against multiple users connecting to a remote sys-
     tem by opening modems and terminal lines with exclusive access, and by
     honoring the locking protocol used by uucico(8).

     During file transfers, tip provides a running count of the number of
     lines transferred.  When using the ~> and ~< commands, the eofread and
     eofwrite variables are used to recognize end-of-file when reading, and
     specify end-of-file when writing (see below).  File transfers normally
     depend on tandem mode for flow control.  If the remote system does not
     support tandem mode, echocheck may be set to indicate that tip should
     synchronize with the remote system on the echo of each transmitted char-
     acter.

     When tip must dial a phone number to connect to a system, it will print
     various messages indicating its actions.  The tip utility supports a
     variety of auto-call units and modems with the at capability in system
     descriptions.

     Support for Ventel 212+ (ventel), Hayes AT-style (hayes), USRobotics
     Courier (courier), Telebit T3000 (t3000) and Racal-Vadic 831 (vadic)
     units is enabled by default.

     Support for Bizcomp 1031[fw] (biz31[fw]), Bizcomp 1022[fw] (biz22[fw]),
     DEC DF0[23]-AC (df0[23]), DEC DN-11 (dn11) and Racal-Vadic 3451 (v3451)
     units can be added by recompiling tip with the appropriate defines.

     Note that if support for both the Racal-Vadic 831 and 3451 is enabled,
     they are referred to as the v831 and v3451, respectively.	If only one of
     the two is supported, it is referred to as vadic.

   Variables
     The tip utility maintains a set of variables which control its operation.
     Some of these variables are read-only to normal users (root is allowed to
     change anything of interest).  Variables may be displayed and set through
     the ~s escape.  The syntax for variables is patterned after vi(1) and
     Mail(1).  Supplying ``all'' as an argument to the set command displays
     all variables readable by the user.  Alternatively, the user may request
     display of a particular variable by attaching a `?' to the end.  For
     example, ``escape?'' displays the current escape character.

     Variables are numeric, string, character, or boolean values.  Boolean
     variables are set merely by specifying their name; they may be reset by
     prepending a `!' to the name.  Other variable types are set by concate-
     nating an `=' and the value.  The entire assignment must not have any
     blanks in it.  A single set command may be used to interrogate as well as
     set a number of variables.  Variables may be initialized at run time by
     placing set commands (without the ~s prefix in a file .tiprc in one's
     home directory).  The -v option causes tip to display the sets as they
     are made.	Certain common variables have abbreviations.  The following is
     a list of common variables, their abbreviations, and their default val-
     ues:

     beautify
	     (num) When dialing a phone number, the time (in seconds) to wait
	     for a connection to be established; abbreviated dial.

     echocheck
	     (bool) Synchronize with the remote host during file transfer by
	     waiting for the echo of the last character transmitted; default
	     is off.

     eofread
	     (str) The set of characters which signify an end-of-transmission
	     during a ~< file transfer command; abbreviated eofr.

     eofwrite
	     (str) The string sent to indicate end-of-transmission during a ~>
	     file transfer command; abbreviated eofw.

     eol     (str) The set of characters which indicate an end-of-line.  The
	     tip utility will recognize escape characters only after an end-
	     of-line.

     escape  (char) The command prefix (escape) character; abbreviated es;
	     default value is `~'.

     exceptions
	     (str) The set of characters which should not be discarded due to
	     the beautification switch; abbreviated ex; default value is
	     ``\t\n\f\b''.

     force   (char) The character used to force literal data transmission;
	     abbreviated fo; default value is `^P'.

     framesize
	     (num) The amount of data (in bytes) to buffer between file system
	     writes when receiving files; abbreviated fr.

     host    (str) The name of the host to which you are connected; abbrevi-
	     ated ho.

     prompt  (char) The character which indicates an end-of-line on the remote
	     host; abbreviated pr; default value is `\n'.  This value is used
	     to synchronize during data transfers.  The count of lines trans-
	     ferred during a file transfer command is based on receipt of this
	     character.

     raise   (bool) Upper case mapping mode; abbreviated ra; default value is
	     off.  When this mode is enabled, all lowercase letters will be
	     mapped to uppercase by tip for transmission to the remote
	     machine.

     raisechar
	     (char) The input character used to toggle uppercase mapping mode;
	     abbreviated rc; default value is `^A'.

     record  (str) The name of the file in which a session script is recorded;
	     abbreviated rec; default value is tip.record.

     script  (bool) Session scripting mode; abbreviated sc; default is off.
	     When script is true, tip will record everything transmitted by
	     tab; default value is false.  Each tab is expanded to 8 spaces.

     verbose
	     (bool) Verbose mode; abbreviated verb; default is true.  When
	     verbose mode is enabled, tip prints messages while dialing, shows
	     the current number of lines transferred during a file transfer
	     operations, and more.

ENVIRONMENT

     SHELL   The name of the shell to use for the ~! command; default value is
	     /bin/sh.

     HOME    The home directory to use for the ~c command.

     HOST    The default value for system-name if none is specified via the
	     command line.

     REMOTE  A system description, or an absolute path to a remote(5) system
	     description database.

     PHONES  A path to a phones(5) database.

FILES

     /etc/remote	     global remote(5) database
     /etc/phones	     default phones(5) file
     ~/.tiprc		     initialization file
     tip.record 	     record file
     /var/log/aculog	     line access log
     /var/spool/lock/LCK..*  lock file to avoid conflicts with uucp(1)

SEE ALSO

     phones(5), remote(5)

HISTORY

     The tip command appeared in 4.2BSD.

BUGS

     The full set of variables is undocumented and should, probably, be pared
     down.

FreeBSD 5.4		       September 9, 2001		   FreeBSD 5.4

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