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TPUT(1P)		   POSIX Programmer's Manual		      TPUT(1P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       tput - change terminal characteristics

SYNOPSIS
       tput [-T type] operand...

DESCRIPTION
       The tput utility shall  display	terminal-dependent  information.   The
       manner  in  which  this	information  is	 retrieved is unspecified. The
       information displayed shall clear the terminal screen,  initialize  the
       user's terminal, or reset the user's terminal, depending on the operand
       given. The  exact  consequences	of  displaying	this  information  are
       unspecified.

OPTIONS
       The  tput  utility  shall  conform  to  the  Base Definitions volume of
       IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.

       The following option shall be supported:

       -T  type
	      Indicate the type of terminal. If this option  is	 not  supplied
	      and  the	TERM variable is unset or null, an unspecified default
	      terminal type shall be used. The	setting	 of  type  shall  take
	      precedence over the value in TERM.

OPERANDS
       The following strings shall be supported as operands by the implementa‐
       tion in the POSIX locale:

       clear  Display the clear-screen sequence.

       init   Display the sequence that initializes the user's terminal in  an
	      implementation-defined manner.

       reset  Display  the  sequence  that  resets  the	 user's terminal in an
	      implementation-defined manner.

       If a terminal does not support any of the operations described by these
       operands, this shall not be considered an error condition.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of tput:

       LANG   Provide  a  default value for the internationalization variables
	      that are unset or null. (See  the	 Base  Definitions  volume  of
	      IEEE Std 1003.1-2001,  Section  8.2,  Internationalization Vari‐
	      ables for the precedence of internationalization variables  used
	      to determine the values of locale categories.)

       LC_ALL If  set  to a non-empty string value, override the values of all
	      the other internationalization variables.

       LC_CTYPE
	      Determine the locale for	the  interpretation  of	 sequences  of
	      bytes  of	 text  data as characters (for example, single-byte as
	      opposed to multi-byte characters in arguments).

       LC_MESSAGES
	      Determine the locale that should be used to  affect  the	format
	      and contents of diagnostic messages written to standard error.

       NLSPATH
	      Determine the location of message catalogs for the processing of
	      LC_MESSAGES .

       TERM   Determine the terminal type. If this variable is unset or	 null,
	      and  if  the  -T option is not specified, an unspecified default
	      terminal type shall be used.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       If standard output is a terminal device, it may be used for writing the
       appropriate  sequence  to  clear	 the screen or reset or initialize the
       terminal. If standard  output  is  not  a  terminal  device,  undefined
       results occur.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0     The requested string was written successfully.

	1     Unspecified.

	2     Usage error.

	3     No information is available about the specified terminal type.

	4     The specified operand is invalid.

       >4     An error occurred.

CONSEQUENCES OF ERRORS
       If  one of the operands is not available for the terminal, tput contin‐
       ues processing the remaining operands.

       The following sections are informative.

APPLICATION USAGE
       The difference between resetting and initializing a  terminal  is  left
       unspecified, as they vary greatly based on hardware types.  In general,
       resetting is a more severe action.

       Some terminals use control characters to perform the stated  functions,
       and on such terminals it might make sense to use tput to store the ini‐
       tialization strings in a file or environment variable  for  later  use.
       However,	 because other terminals might rely on system calls to do this
       work, the standard output cannot be used in a portable manner, such  as
       the following non-portable constructs:

	      ClearVar=`tput clear`
	      tput reset | mailx -s "Wake Up" ddg

EXAMPLES
	1. Initialize  the  terminal  according to the type of terminal in the
	   environmental variable TERM.	 This command can  be  included	 in  a
	   .profile file.

	   tput init

	2. Reset a 450 terminal.

	   tput -T 450 reset

RATIONALE
       The  list  of  operands was reduced to a minimum for the following rea‐
       sons:

	* The only features chosen were those that were likely to be  used  by
	  human users interacting with a terminal.

	* Specifying  the  full terminfo set was not considered desirable, but
	  the standard developers did not want to select among operands.

	* This volume of IEEE Std 1003.1-2001  does  not  attempt  to  provide
	  applications	with  sophisticated terminal handling capabilities, as
	  that falls outside of its assigned scope  and	 intersects  with  the
	  responsibilities of other standards bodies.

       The  difference	between	 resetting and initializing a terminal is left
       unspecified as this varies greatly based on hardware  types.   In  gen‐
       eral, resetting is a more severe action.

       The  exit  status  of  1	 is historically reserved for finding out if a
       Boolean operand is not set. Although the operands  were	reduced	 to  a
       minimum,	 the exit status of 1 should still be reserved for the Boolean
       operands, for those sites that wish to support them.

FUTURE DIRECTIONS
       None.

SEE ALSO
       stty, tabs

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			      TPUT(1P)
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