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NetBSD 6.1.5 - man page for cu (netbsd section 1)

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TIP(1)				   BSD General Commands Manual				   TIP(1)

NAME
     tip, cu -- serial terminal emulator

SYNOPSIS
     tip [-v] -speed system-name
     tip [-v] -speed phone-number
     cu [options] phone-number
     cu [options] ``dir''
     cu --help

DESCRIPTION
     tip and cu are used to connect to another system over a serial link.  In the era before mod-
     ern networks, they were typically used to connect to a modem in order to dial in to a remote
     host.  They are now frequently used for tasks such as attaching to the serial console of
     another machine for administrative or debugging purposes.

     The following option is available for tip:

     -v    Set verbose mode.

     The following options are available for cu:

     -a acu
	   Set the ACU port.

     -c number
	   Call this number.

     -E char
	   Use this escape character.

     -e    Use even parity.

     -F flow
	   Set flow control to hard, soft, or none.

     -f    Use no flow control.

     -h    Echo characters locally (half-duplex mode).

     -l line
	   Specify the line to use.  Either of the forms like tty00 or /dev/tty00 are permitted.

     -n    No escape (disable tilde).

     -o    Use odd parity.

     -P parity
	   Set parity to even or odd.

     -p acu
	   Set the ACU port.

     -s speed
	   Set the speed of the connection.  Defaults to 9600.

     -t    Connect via a hard-wired connection to a host on a dial-up line.

     For cu, if both -e and -o are given, then no parity is used.  This is the default behaviour.

     If speed is specified it will override any baudrate specified in the system 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.  tip prompts for the name of a local file to transmit.

     ~<    Copy file from remote to local.  tip prompts first for the name of the file to be
	   sent, then for a command to be executed on the remote machine.

     ~p from [to]
	   Send a file to a remote UNIX host.  The put command causes the remote UNIX system to
	   run the command string ``cat > 'to''', while tip sends it the ``from'' file.  If the
	   ``to'' file isn't specified the ``from'' file name is used.	This command is actually
	   a UNIX specific 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 isn't 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 protocols such as XMODEM.
	   The child program will be run with the following arrangement of file descriptors:

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

     ~+    Synonym for ~C, provided for compatibility with other versions of cu.

     ~#    Send a BREAK to the remote system.  For systems which don't support the necessary
	   ioctl call the break is simulated by a sequence of line speed changes and DEL charac-
	   ters.

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

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

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

     ~?    Get a summary of the tilde escapes

     tip uses the file /etc/remote to find how to reach a particular system and to find out how
     it should operate while talking to the system; refer to remote(5) for a full description.
     Each system has a default baud rate with which to establish a connection.	If this value is
     not suitable, the baud rate to be used may be specified on the command line, e.g.	'tip -300
     mds'.

     When tip establishes a connection it sends out a connection message to the remote system;
     the default value, if any, is defined in /etc/remote (see remote(5)).

     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 dialogue and return you to the remote machine.

     tip guards against multiple users connecting to a remote system by opening modems and termi-
     nal 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 recog-
     nize 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 tip should synchronize with the
     remote system on the echo of each transmitted character.

     When tip must dial a phone number to connect to a system it will print various messages
     indicating its actions.  tip supports the DEC DN-11 and Racal-Vadic 831 auto-call-units; the
     DEC DF02 and DF03, Ventel 212+, Racal-Vadic 3451, and Bizcomp 1031 and 1032 integral call
     unit/modems.

   VARIABLES
     tip 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 vari-
     ables 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 concatenating 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 values.

     beautify	   (bool) Discard unprintable characters when a session is being scripted; abbre-
		   viated be.

     baudrate	   (num) The baud rate at which the connection was established; abbreviated ba.

     dialtimeout   (num) When dialing a phone number, the time (in seconds) to wait for a connec-
		   tion 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 trans-
		   fer command; abbreviated eofw.

     eol	   (str) The set of characters which indicate an end-of-line.  tip 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 beautifi-
		   cation 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; abbreviated ho.

     prompt	   (char) The character which indicates an end-of-line on the remote host; abbre-
		   viated pr; default value is `\n'.  This value is used to synchronize during
		   data transfers.  The count of lines transferred 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 lower case letters will be mapped to upper case by
		   tip for transmission to the remote machine.

     raisechar	   (char) The input character used to toggle upper case 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 the remote machine in the
		   script record file specified in record.  If the beautify switch is on, only
		   printable ASCII characters will be included in the script file (those charac-
		   ters between 040 and 0177).	The variable exceptions is used to indicate char-
		   acters which are an exception to the normal beautification rules.

     tabexpand	   (bool) Expand tabs to spaces during file transfers; abbreviated tab; default
		   value is false.  Each tab is expanded to 8 spaces.

     tandem	   (bool) Use XON/XOFF flow control to throttle data from the remote host; abbre-
		   viated ta.  The default value is true unless the nt capability has been speci-
		   fied in /etc/remote, in which case the default value is false.

     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
     tip uses the following environment variables:

     SHELL	 (str) The name of the shell to use for the ~! command; default value is
		 ``/bin/sh'', or taken from the environment.

     HOME	 (str) The home directory to use for the ~c command; default value is taken from
		 the environment.

     HOST	 Check for a default host if none specified.

     The variables ${REMOTE} and ${PHONES} are also exported.

FILES
     /etc/remote	     Global system descriptions.
     /etc/phones	     Global phone number data base.
     ${REMOTE}		     Private system descriptions.
     ${PHONES}		     Private phone numbers.
     ~/.tiprc		     Initialization file.
     tip.record 	     Record file.

DIAGNOSTICS
     Diagnostics are, hopefully, self explanatory.

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.

BSD					November 29, 2006				      BSD
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