ttytype(1)						      General Commands Manual							ttytype(1)

NAME

       ttytype - terminal identification program

SYNOPSIS

       type]

DESCRIPTION

       automatically  identifies  the  current terminal type by sending an identification request sequence to the terminal.  This method works for
       local, modem, and remote terminal connections, as well as for the and terminal emulators.

       Once the terminal has been identified, prints the terminal's type to the standard output (see terminfo(4)).  This string is usually used as
       the value for the environment variable.

       If is unable to determine the correct terminal type, it prompts the user for the correct terminal identification string.

   Options
       recognizes the following options:

	      Causes	to  return  an ID of "unknown" instead of prompting for the terminal type if auto-identification fails.  If this option is
			not present, interactively prompts the user for the terminal type if it is unable to determine the correct type  automati-
			cally.

	      Causes	to  prompt  for the terminal type before it sends the terminal identification request sequence.  If the user responds with
			only a carriage return, proceeds with the automatic terminal identification process.  Any other response is taken  as  the
			correct terminal type.	Note that the and variables are not set if the user manually enters a terminal type.

			The option is normally used only for terminals that do not behave well when presented with terminal identification request
			sequence.  It gives the user a chance to respond with the correct terminal type before any escape sequences are sent  that
			could have an adverse effect on the terminal.

			The option can be used in conjunction with the option.	The option only inhibits interactive prompting after has failed to
			identify the terminal by other means.

	      Tells	to print a series of shell commands to set the and environment variables to appropriate values.  In addition, the variable
			is  set  to  the two-character sequence representing the appropriate erase character for the terminal (DEL for ANSI termi-
			nals, backspace for all others).  This two-character sequence can then be used as an  argument	to  or	(see  stty(1)  and
			tset(1)).

			The environment variable is consulted to see which shell syntax to use for setting the environment variables.  This output
			is normally used with a command of the form:

	      normally attempts identification of Wyse, ANSI and HP terminals.
			The type argument can be used to restrict the inquiry to that required for terminals of the specified type.  The  accepted
			types are and Multiple options can be specified.

	      Enable verbose messages to standard error.

   Notes
       Use  of	the  option  is highly recommended because many terminals support variable-size displays.  This option provides the only means for
       automatically configuring the user environment in such a manner that applications can handle these terminals correctly.	Note that and  are
       not set if the option is used and the user manually enters a terminal type.

       The following steps are performed in the order indicated when identifying a terminal:

	 1. tries the Wyse 30/50/60 id request sequence.

	 2. tries the standard ANSI ID request sequence.  If a response is received, it is converted to a string according to an internal table.

	 3. tries the HP id request sequence.

	 4. If none of the above steps succeed, prompts interactively for the correct terminal type unless the option has been given.

       may skip one or more of the first three steps, depending on the presence of options.

       The  HP	ID  request  sequence  can switch some ANSI terminals into an unexpected operating mode.  Recovery from such a condition sometimes
       requires cycling power on the terminal.	To avoid this problem, always sends the HP identification sequence last.

EXAMPLES

       is most commonly used as part of the login sequence.  The following shell script fragment can be used during login shell initialization:

	      #
	      # If TERM is not set, see if our port is listed in /etc/ttytype.
	      # If /etc/ttytype doesn't have information for our port, run
	      # ttytype(1) to try to determine the type of terminal we have.
	      #
	      # To have ttytype(1) prompt for the terminal type before trying
	      # to automatically identify the terminal, add the "-p" option
	      # to the "ttytype -s" command below.
	      #
	      if [ -z "$TERM" -o "$TERM" = network ]; then
		  unset TERM
		  eval `tset -s -Q`
		  if [ -z "$TERM" -o "$TERM" = unknown ]; then
		      eval `ttytype -s`
		      tset -Q -e ${ERASE:-^h} $TERM
		  fi
	      fi

WARNINGS

       The terminal identification sequences sent by can cause unexpected behavior on terminals other than the Wyse 30/50/60, standard ANSI or	HP
       terminals.   If	you  have such terminals in your configuration, use the or options to prevent from sending sequences that cause unexpected
       behavior.

AUTHOR

       was developed by HP.

SEE ALSO

       csh(1), ksh(1), sh(1), stty(1), ttytype(4), environ(5).

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