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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>tput</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="tput"></a> <a name="tag_04_144"></a><!-- tput --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_04_144_01"></a>NAME</h4><blockquote>tput - change terminal characteristics</blockquote><h4><a name="tag_04_144_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('UP')">UP</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> tput</tt> <b>[</b><tt>-T</tt> <i>type</i><b>]</b> <i>operand</i><tt>... <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div></blockquote><h4><a name="tag_04_144_03"></a>DESCRIPTION</h4><blockquote><p>The <i>tput</i> utility shall display terminal-dependent information. The manner in which this information is retrieved isunspecified. The information displayed shall clear the terminal screen, initialize the user's terminal, or reset the user'sterminal, depending on the operand given. The exact consequences of displaying this information are unspecified.</p></blockquote><h4><a name="tag_04_144_04"></a>OPTIONS</h4><blockquote><p>The <i>tput</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p><p>The following option shall be supported:</p><dl compact><dt><b>-T </b> <i>type</i></dt><dd>Indicate the type of terminal. If this option is not supplied and the <i>TERM</i> variable is unset or null, an unspecifieddefault terminal type shall be used. The setting of <i>type</i> shall take precedence over the value in <i>TERM .</i></dd></dl></blockquote><h4><a name="tag_04_144_05"></a>OPERANDS</h4><blockquote><p>The following strings shall be supported as operands by the implementation in the POSIX locale:</p><dl compact><dt><b>clear</b></dt><dd>Display the clear-screen sequence.</dd><dt><b>init</b></dt><dd>Display the sequence that initializes the user's terminal in an implementation-defined manner.</dd><dt><b>reset</b></dt><dd>Display the sequence that resets the user's terminal in an implementation-defined manner.</dd></dl><p>If a terminal does not support any of the operations described by these operands, this shall not be considered an errorcondition.</p></blockquote><h4><a name="tag_04_144_06"></a>STDIN</h4><blockquote><p>Not used.</p></blockquote><h4><a name="tag_04_144_07"></a>INPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_144_08"></a>ENVIRONMENT VARIABLES</h4><blockquote><p>The following environment variables shall affect the execution of <i>tput</i>:</p><dl compact><dt><i>LANG</i></dt><dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> forthe precedence of internationalization variables used to determine the values of locale categories.)</dd><dt><i>LC_ALL</i></dt><dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd><dt><i>LC_CTYPE</i></dt><dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte asopposed to multi-byte characters in arguments).</dd><dt><i>LC_MESSAGES</i></dt><dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standarderror.</dd><dt><i>NLSPATH</i></dt><dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd><dt><i>TERM</i></dt><dd>Determine the terminal type. If this variable is unset or null, and if the <b>-T</b> option is not specified, an unspecifieddefault terminal type shall be used.</dd></dl></blockquote><h4><a name="tag_04_144_09"></a>ASYNCHRONOUS EVENTS</h4><blockquote><p>Default.</p></blockquote><h4><a name="tag_04_144_10"></a>STDOUT</h4><blockquote><p>If standard output is a terminal device, it may be used for writing the appropriate sequence to clear the screen or reset orinitialize the terminal. If standard output is not a terminal device, undefined results occur.</p></blockquote><h4><a name="tag_04_144_11"></a>STDERR</h4><blockquote><p>The standard error shall be used only for diagnostic messages.</p></blockquote><h4><a name="tag_04_144_12"></a>OUTPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_144_13"></a>EXTENDED DESCRIPTION</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_144_14"></a>EXIT STATUS</h4><blockquote><p>The following exit values shall be returned:</p><dl compact><dt> 0</dt><dd>The requested string was written successfully.</dd><dt> 1</dt><dd>Unspecified.</dd><dt> 2</dt><dd>Usage error.</dd><dt> 3</dt><dd>No information is available about the specified terminal type.</dd><dt> 4</dt><dd>The specified operand is invalid.</dd><dt>>4</dt><dd>An error occurred.</dd></dl></blockquote><h4><a name="tag_04_144_15"></a>CONSEQUENCES OF ERRORS</h4><blockquote><p>If one of the operands is not available for the terminal, <i>tput</i> continues processing the remaining operands.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_04_144_16"></a>APPLICATION USAGE</h4><blockquote><p>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.</p><p>Some terminals use control characters to perform the stated functions, and on such terminals it might make sense to use<i>tput</i> to store the initialization strings in a file or environment variable for later use. However, because other terminalsmight rely on system calls to do this work, the standard output cannot be used in a portable manner, such as the followingnon-portable constructs:</p><pre><tt>ClearVar=`tput clear`tput reset | mailx -s "Wake Up" ddg</tt></pre></blockquote><h4><a name="tag_04_144_17"></a>EXAMPLES</h4><blockquote><ol><li><p>Initialize the terminal according to the type of terminal in the environmental variable <i>TERM .</i> This command can beincluded in a <b>.profile</b> file.</p><pre><tt>tput init</tt></pre></li><li><p>Reset a 450 terminal.</p><pre><tt>tput -T 450 reset</tt></pre></li></ol></blockquote><h4><a name="tag_04_144_18"></a>RATIONALE</h4><blockquote><p>The list of operands was reduced to a minimum for the following reasons:</p><ul><li><p>The only features chosen were those that were likely to be used by human users interacting with a terminal.</p></li><li><p>Specifying the full <i>terminfo</i> set was not considered desirable, but the standard developers did not want to select amongoperands.</p></li><li><p>This volume of IEEE Std 1003.1-2001 does not attempt to provide applications with sophisticated terminal handlingcapabilities, as that falls outside of its assigned scope and intersects with the responsibilities of other standards bodies.</p></li></ul><p>The difference between resetting and initializing a terminal is left unspecified as this varies greatly based on hardware types.In general, resetting is a more severe action.</p><p>The exit status of 1 is historically reserved for finding out if a Boolean operand is not set. Although the operands werereduced to a minimum, the exit status of 1 should still be reserved for the Boolean operands, for those sites that wish to supportthem.</p></blockquote><h4><a name="tag_04_144_19"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_144_20"></a>SEE ALSO</h4><blockquote><p><a href="stty.html"><i>stty</i></a> , <a href="tabs.html"><i>tabs</i></a></p></blockquote><h4><a name="tag_04_144_21"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4.</p></blockquote><h4><a name="tag_04_144_22"></a>Issue 6</h4><blockquote><p>This utility is marked as part of the User Portability Utilities option.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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