Provided by: ncurses-bin_5.9-4_i386 bug

NAME

       tset, reset - terminal initialization

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  System-V-like  UNIXes
       and  systems using that convention, 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
       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 terminfo 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
       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
       initialization.  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:

       -c   Set  control  characters and modes.  -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 the section
            TERMINAL TYPE MAPPING for more information.

       -Q   Do not display any values for the erase, interrupt and  line  kill
            characters.    Normally  tset  displays  the  values  for  control
            characters 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.
            Normally 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
       system  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
       particular speed, guess that I'm on that kind of terminal''.

       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  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
       exclamation 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
       letter) 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
       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.  The -adnp options  are  therefore  omitted
       from the usage summary above.

       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.

       As  of 4.4BSD, 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.

ENVIRONMENT

       The tset command uses these environment variables:

       SHELL
            tells tset whether to initialize TERM using sh or csh syntax.

       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
            variable from the environment  before  looking  for  the  terminal
            description.

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 5.9 (patch 20110404).

                                                                       tset(1)