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    Command:

    reset

    
    
    

    SYNOPSIS

           tset [-IQVcqrsw] [-] [-e ch] [-i ch] [-k ch] [-m mapping] [terminal]
           reset [-IQVcqrsw] [-] [-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.
    
           1. The terminal argument specified on the command line.
    
           2. The value of the TERM environmental variable.
    
           3.  (BSD  systems only.) The terminal type associated with the standard
           error output device in the /etc/ttys file.  (On Linux and System-V-like
           UNIXes,  getty  does  this  job  by  setting TERM according to the type
           passed to it by /etc/inittab.)
    
           4. The default terminal type, ''unknown''.
    
           If the terminal type was not specified  on  the  command-line,  the  -m
           option mappings are then applied (see the section TERMINAL TYPE MAPPING
           for more information).  Then, if the terminal type begins with a  ques-
           tion  mark (''?''), the user is prompted for confirmation of the termi-
           nal type.  An empty response confirms the type, or, another type can be
           entered  to specify a new type.  Once the terminal type has been deter-
           mined, the terminfo entry for the terminal is retrieved.   If  no  ter-
           minfo  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  stan-
           dard  error  output.   Finally,  if  the erase, interrupt and line kill
           characters have changed, or are not set to their default values,  their
           values  are  displayed  to the standard error output.  Use the -c or -w
           option to select only the window sizing versus  the  other  initializa-
           tion.  If neither option is given, both are assumed.
    
           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 an 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:
           -Q   Do not display any values for the erase, interrupt and  line  kill
                characters.  Normally tset displays the values for control charac-
                ters which differ from the system's default values.
    
           -q   The terminal type is displayed to the  standard  output,  and  the
                terminal  is not initialized in any way.  The option '-' by itself
                is equivalent but archaic.
    
           -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 SETTING THE
                ENVIRONMENT for details.
    
           -V   reports the version of ncurses which was used in this program, and
                exits.
    
           -w   Resize  the  window to match the size deduced via setupterm.  Nor-
                mally this has no effect, unless setupterm is not able  to  detect
                the window size.
    
           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 capabilities 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
           csh, otherwise, they are for sh.  Note, the csh 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 ... `
    
    
    

    TERMINAL TYPE MAPPING

           When the terminal is not hardwired into the system (or the current sys-
           tem  information  is  incorrect)  the  terminal  type  derived from the
           /etc/ttys file or the TERM environmental variable  is  often  something
           generic  like  network,  dialup,  or  unknown.   When tset is used in a
           startup script 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 partic-
           ular speed, guess that I'm on that kind of terminal''.
    
           The  argument  to  the  -m option consists of an optional port type, an
    
           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 baud rate is specified, the terminal type  will  match  any  baud
           rate.   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 meta-characters, it is suggested that the
           entire -m option argument be placed within single quote characters, and
           that csh users insert a backslash character (''\'') before any exclama-
           tion marks (''!'').
    
    
    

    HISTORY

           The tset command appeared in BSD 3.0.  The ncurses  implementation  was
           lightly  adapted  from the 4.4BSD sources for a terminfo environment by
           Eric S. Raymond <esr@snark.thyrsus.com>.
    
    
    

    COMPATIBILITY

           The tset utility has been provided for backward-compatibility with  BSD
           environments  (under  most modern UNIXes, /etc/inittab and getty(1) can
           set TERM appropriately for each dial-up line; this  obviates  what  was
           tset's  most  important  use).  This implementation behaves like 4.4BSD
           tset, with a few exceptions specified here.
    
           The -S option of BSD tset no longer works; it prints an  error  message
           to  stderr  and dies.  The -s option only sets TERM, not TERMCAP.  Both
           these changes are because the TERMCAP variable is no  longer  supported
           under  terminfo-based  ncurses, which makes tset -S useless (we made it
           die noisily rather than silently induce lossage).
    
           There was an undocumented 4.4BSD feature that invoking tset via a  link
           named  'TSET'  (or via any other name beginning with an upper-case let-
           ter) set the terminal to use upper-case only.  This  feature  has  been
           omitted.
    
           The -A, -E, -h, -u and -v options were deleted from the tset utility in
           4.4BSD.  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 docu-
           mented 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.  The -adnp options are therefore omitted from the usage
           summary above.
    
           TERM Denotes your terminal  type.   Each  terminal  type  is  distinct,
                though many are similar.
    
           TERMCAP
                may  denote  the  location of a termcap database.  If it is not an
                absolute pathname, e.g., begins with a '/', tset removes the vari-
                able from the environment before looking for the terminal descrip-
                tion.
    
    
    

    FILES

           /etc/ttys
                system port name to terminal type mapping database  (BSD  versions
                only).
    
           /usr/share/terminfo
                terminal capability database
    
    
    

    SEE ALSO

           csh(1),   sh(1),   stty(1),   curs_terminfo(3X),  tty(4),  terminfo(5),
           ttys(5), environ(7)
    
           This describes ncurses version 5.7 (patch 20090207).
    
                                                                           tset(1)
    
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