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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>tabs</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_014_2163"> </a>NAME</h4><blockquote>tabs - set terminal tabs</blockquote><h4><a name = "tag_001_014_2164"> </a>SYNOPSIS</h4><blockquote><pre><code>tabs <b>[</b> -<i>n</i>| -a| -a2| -c| -c2| -c3| -f| -p| -s| -u<b>][</b>+m<b>[</b><i>n</i><b>]]</b><b>[</b>-T <i>type</i><b>]</b>tabs <b>[</b>-T <i>type</i><b>][</b> +<b>[</b><i>n</i><b>]]</b><i> n1</i><b>[</b>,<i>n2</i>,...<b>]</b></code></pre></blockquote><h4><a name = "tag_001_014_2165"> </a>DESCRIPTION</h4><blockquote>The<i>tabs</i>utility displays a series of charactersthat first clears the hardware terminal tab settings andthen initialises the tab stops at the specified positionsand optionally adjusts the margin.<p>The phrase "tab-stop position<i>N</i>"is taken to mean that, from the start of a line ofoutput, tabbing to position<i>N</i>will cause the next character output tobe in the(<i>N</i>+1)thcolumn position on that line.The maximum number of tab stops allowed is terminal-dependent.<p>It need not be possible to implement<i>tabs</i>on certain terminals.If the terminal type obtained from the<i>TERM</i>environment variable or<b>-T</b>option represents such a terminal,an appropriatediagnostic message will be written to standard error and<i>tabs</i>will exit with a status greater than zero.</blockquote><h4><a name = "tag_001_014_2166"> </a>OPTIONS</h4><blockquote>The<i>tabs</i>utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b> </a> ,except for various extensions:the options<b>-a2</b>,<b>-c2</b>and<b>-c3</b>are multi-character and+m<i>n</i>uses a leading plus sign and an optional option-argument.<p>The following options are supported:<dl compact><dt><b>-</b><i>n</i><dd>Specify repetitive tab stops separatedby a uniform number of column positions,<i>n</i>,where<i>n</i>is a single-digit decimal number.The default usage of<i>tabs</i>with no arguments is equivalent totabs -8.When<b>-0</b>is used, the tab stops are cleared and no new ones set.<dt><b>-a</b><dd>1,10,16,36,72Assembler, applicable to some mainframes.<dt><b>-a2</b><dd>1,10,16,40,72Assembler, applicable to some mainframes.<dt><b>-c</b><dd>1,8,12,16,20,55COBOL, normal format.<dt><b>-c2</b><dd>1,6,10,14,49COBOL,compact format (columns 1-6 omitted).<dt><b>-c3</b><dd>1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67COBOLcompact format (columns 1-6 omitted), with more tabs than<b>-c2</b>.<dt><b>-f</b><dd>1,7,11,15,19,23FORTRAN<dt><b>-p</b><dd>1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61PL/1<dt><b>-s</b><dd>1,10,55SNOBOL<dt><b>-u</b><dd>1,12,20,44Assembler, applicable to some mainframes.<dt><b>-T </b><i>type</i><dd>Indicate the type of terminal.If this option is notsupplied and the<i>TERM</i>variable is unset or null,an unspecified default terminal type will be used.The setting of<i>type</i>will take precedence over the value in<i>TERM .</i><dt><b>+m[</b><i>n</i><b>]</b><dd>Reset the margin.The margin argument can be used for some terminals.It causes all tabs to be moved over<i>n</i>columns by making column<i>n</i>+1the left margin.If<i>n</i>is omitted, the default is 10.The normal (leftmost) margin on most terminals isobtained by+m0.The margin for most terminals is reset only when the+mflag is given explicitly.</dl></blockquote><h4><a name = "tag_001_014_2167"> </a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>n1</i><b>[,</b><i>n2</i><b>,</b>...<b>]</b><dd>A single command-line argument that consists of tab-stop valuesseparatedusing either commas orblank characters.The tab-stop values will be positive decimal integersin strictly ascending order.If any number (except the first one) is preceded by a plus sign, it is takenas an increment to be added to the previous value.For example, the tab lists1,10,20,30and1,10,+10,+10are considered to be identical.</dl></blockquote><h4><a name = "tag_001_014_2168"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2169"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2170"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>tabs</i>:<dl compact><dt><i>LANG</i><dd>Provide a default value for the internationalisation variablesthat are unset or null.If<i>LANG</i>is unset or null, the corresponding value from theimplementation-dependent default locale will be used.If any of the internationalisation variables contains an invalid setting, theutility will behave as if none of the variables had been defined.<dt><i>LC_ALL</i><dd>If set to a non-empty string value,override the values of all the other internationalisation variables.<dt><i>LC_CTYPE</i><dd>Determine thelocale for the interpretation of sequences of bytes of text data ascharacters (for example, single- as opposed to multi-byte charactersin arguments).<dt><i>LC_MESSAGES</i><dd>Determine the locale that should be used to affectthe format and contents of diagnosticmessages written to standard error.<dt><i>NLSPATH</i><dd>Determine the location of message cataloguesfor the processing of<i>LC_MESSAGES .</i><dt><i>TERM</i><dd>Determine the terminal type.If this variable isunset or null,and if the<b>-T</b>option is not specified, an unspecified defaultterminal type will be used.</dl></blockquote><h4><a name = "tag_001_014_2171"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2172"> </a>STDOUT</h4><blockquote>If standard output is a terminal,the appropriate sequence to clear and set the tab stopsmay be written to standard outputin an unspecified format.If standard output is not a terminal,undefined results occur.</blockquote><h4><a name = "tag_001_014_2173"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_2174"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2175"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2176"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Successful completion.<dt>>0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_2177"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2178"> </a>APPLICATION USAGE</h4><blockquote>This utility makes use of the terminal's hardware tabs and the<i><a href="stty.html">stty</a></i><i>tabs</i>option.<p>This utility is not recommended for application use.<p>Some integrated display units might not haveescape sequences to set tab stops, but may be set byinternal system calls.On these terminals,<i>tabs</i>will work if standard output is directed to the terminal;if output is directed to another file, however,<i>tabs</i>will fail.</blockquote><h4><a name = "tag_001_014_2179"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2180"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2181"> </a>SEE ALSO</h4><blockquote><i><a href="expand.html">expand</a></i>,<i><a href="stty.html">stty</a></i>,<i><a href="unexpand.html">unexpand</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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