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

TSET(1) 			   BSD General Commands Manual				  TSET(1)

NAME
     tset, reset -- terminal initialization

SYNOPSIS
     tset [-IQrs] [-] [-e ch] [-i ch] [-k ch] [-m mapping] [terminal]

     reset [-IQrs] [-] [-e ch] [-i ch] [-k ch] [-m mapping] [terminal]

DESCRIPTION
     tset initializes terminals.  tset first determines the type of terminal that you are using.
     This determination is done as follows, using the first terminal type found.

	   o   The terminal argument specified on the command line.
	   o   The value of the TERM environmental variable.
	   o   The terminal type associated with the standard error output device in the
	       /etc/ttys file.
	   o   The default terminal type, ``unknown''.

     If the terminal type was not specified on the command-line, the -m option mappings are then
     applied (see below for more information).	Then, if the terminal type begins with a question
     mark (``?''), the user is prompted for confirmation of the terminal type.	An empty response
     confirms the type, or, another type can be entered to specify a new type.	Once the terminal
     type has been determined, the termcap entry for the terminal is retrieved.  If no terminfo
     entry is found for the type, the user is prompted for another terminal type.

     Once the terminfo entry is retrieved, the window size, backspace, interrupt and line kill
     characters (among many other things) are set and the terminal and tab initialization strings
     are sent to the standard error output.  Finally, if the erase, interrupt and line kill char-
     acters have changed, or are not set to their default values, their values are displayed to
     the standard error output.

     When invoked as reset, tset sets cooked and echo modes, turns off cbreak and raw modes,
     turns on newline translation and resets any unset special characters to their default values
     before doing the terminal initialization described above.	This is useful after a program
     dies leaving a terminal in a abnormal state.  Note, you may have to type ``<LF>reset<LF>''
     (the line-feed character is normally control-J) to get the terminal to work, as carriage-
     return may no longer work in the abnormal state.  Also, the terminal will often not echo the
     command.

     The options are as follows:

     -	   The terminal type is displayed to the standard output, and the terminal is not ini-
	   tialized in any way.

     -e    Set the erase character to ch.

     -I    Do not send the terminal or tab initialization strings to the terminal.

     -i    Set the interrupt character to ch.

     -k    Set the line kill character to ch.

     -m    Specify a mapping from a port type to a terminal.  See below for more information.

     -Q    Don't display any values for the erase, interrupt and line kill characters.

     -r    Print the terminal type to the standard error output.

     -s    Print the sequence of shell commands to initialize the environment variable TERM to
	   the standard output.  See the section below on setting the environment for details.

     The arguments for the -e, -i and -k options may either be entered as actual characters or by
     using the ``hat'' notation, i.e. control-h may be specified as ``^H'' or ``^h''.

SETTING THE ENVIRONMENT
     It is often desirable to enter the terminal type and information about the terminal's capa-
     bilities into the shell's environment.  This is done using the -s option.

     When the -s option is specified, the commands to enter the information into the shell's
     environment are written to the standard output.  If the SHELL environmental variable ends in
     ``csh'', the commands are for the csh(1), otherwise, they are for sh(1).  Note, the csh(1)
     commands set and unset the shell variable ``noglob'', leaving it unset.  The following line
     in the .login or .profile files will initialize the environment correctly:

	   eval `tset -s options ... `

     To demonstrate a simple use of the -S option, the following lines in the .login file have an
     equivalent effect:

	   set noglob
	   set term=(`tset -S options ...`)
	   setenv TERM $term[1]
	   unset term
	   unset noglob

TERMINAL TYPE MAPPING
     When the terminal is not hardwired into the system (or the current system information is
     incorrect) the terminal type derived from the /etc/ttys file or the TERM environmental vari-
     able is often something generic like ``network'', ``dialup'', or ``unknown''.  When tset is
     used in a startup script (.profile for sh(1) users or .login for csh(1) users) it is often
     desirable to provide information about the type of terminal used on such ports.  The purpose
     of the -m option is to ``map'' from some set of conditions to a terminal type, that is, to
     tell tset ``If I'm on this port at a particular speed, guess that I'm on that kind of termi-
     nal''.

     The argument to the -m option consists of an optional port type, an optional operator, an
     optional baud rate specification, an optional colon (``:'') character and a terminal type.
     The port type is a string (delimited by either the operator or the colon character).  The
     operator may be any combination of: ``>'', ``<'', ``@'', and ``!''; ``>'' means greater
     than, ``<'' means less than, ``@'' means equal to and ``!'' inverts the sense of the test.
     The baud rate is specified as a number and is compared with the speed of the standard error
     output (which should be the control terminal).  The terminal type is a string.

     If the terminal type is not specified on the command line, the -m mappings are applied to
     the terminal type.  If the port type and baud rate match the mapping, the terminal type
     specified in the mapping replaces the current type.  If more than one mapping is specified,
     the first applicable mapping is used.

     For example, consider the following mapping: ``dialup>9600:vt100''.  The port type is
     ``dialup'', the operator is ``>'', the baud rate specification is ``9600'', and the terminal
     type is ``vt100''.  The result of this mapping is to specify that if the terminal type is
     ``dialup'', and the baud rate is greater than 9600 baud, a terminal type of ``vt100'' will
     be used.

     If no port type is specified, the terminal type will match any port type, for example, ``-m
     dialup:vt100 -m :?xterm'' will cause any dialup port, regardless of baud rate, to match the
     terminal type ``vt100'', and any non-dialup port type to match the terminal type ``?xterm''.
     Note, because of the leading question mark, the user will be queried on a default port as to
     whether they are actually using an xterm terminal.

     No whitespace characters are permitted in the -m option argument.	Also, to avoid problems
     with metacharacters, it is suggested that the entire -m option argument be placed within
     single quote characters, and that csh(1) users insert a backslash character (``\'') before
     any exclamation marks (``!'').

ENVIRONMENT
     The tset command uses the SHELL and TERM environment variables.

FILES
     /etc/ttys		       system port name to terminal type mapping database
     /usr/share/misc/terminfo  terminal capability database

SEE ALSO
     csh(1), sh(1), stty(1), tty(4), terminfo(5), ttys(5), environ(7)

HISTORY
     The tset command appeared in 3.0BSD.

COMPATIBILITY
     The -A, -E, -h, -u and -v options have been deleted from the tset utility.  None of them
     were documented in 4.3BSD and all are of limited utility at best.	The -a, -d and -p options
     are similarly not documented or useful, but were retained as they appear to be in widespread
     use.  It is strongly recommended that any usage of these three options be changed to use the
     -m option instead.  The -n option remains, but has no effect.  It is still permissible to
     specify the -e, -i and -k options without arguments, although it is strongly recommended
     that such usage be fixed to explicitly specify the character.

     Executing tset as reset no longer implies the -Q option.  Also, the interaction between the
     - option and the terminal argument in some historic implementations of tset has been
     removed.

     The -E and -S options have been removed as they only make sense for termcap and tset now
     uses terminfo.  As such, the TERMCAP entry has been removed from -s.

     Finally, the tset implementation has been completely redone (as part of the addition to the
     system of a IEEE Std 1003.1-1988 (``POSIX.1'') compliant terminal interface) and will no
     longer compile on systems with older terminal interfaces.

BSD					September 29, 2009				      BSD


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