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<html><head><title>Built-in Variables (UNIX in a Nutshell: System V Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Arnold Robbins" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly & Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="1-56592-427-4" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="UNIX in a Nutshell: System V Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Book Title" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch11_03.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228" /><td align="right" valign="top" width="228"><a href="ch11_05.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">11.4. Built-in Variables</h2><p><a name="IXT-11-123272" /><a name="IXT-11-123273" /><a name="IXT-11-123274" /><a name="IXT-11-123275" /></p><table border="1" cellpadding="3"><tr><th><em class="emphasis">Version</em></th><th><em class="emphasis">Variable</em></th><th><em class="emphasis">Description</em></th></tr><tr><td><tt class="literal">awk</tt></td><td><tt class="literal">FILENAME</tt></td><td><p>Current filename</p></td></tr><tr><td> </td><td><tt class="literal">FS</tt></td><td><p>Field separator (a space)</p></td></tr><tr><td> </td><td><tt class="literal">NF</tt></td><td><p>Number of fields in current record</p></td></tr><tr><td> </td><td><tt class="literal">NR</tt></td><td><p>Number of the current record</p></td></tr><tr><td> </td><td><tt class="literal">OFMT</tt></td><td><p>Output format for numbers (<tt class="literal">"%.6g"</tt>) and for conversion to string</p></td></tr><tr><td> </td><td><tt class="literal">OFS</tt></td><td><p>Output field separator (a space)</p></td></tr><tr><td> </td><td><tt class="literal">ORS</tt></td><td><p>Output record separator (a newline)</p></td></tr><tr><td> </td><td><tt class="literal">RS</tt></td><td><p>Record separator (a newline)</p></td></tr><tr><td> </td><td><tt class="literal">$0</tt></td><td><p>Entire input record</p></td></tr><tr><td> </td><td><tt class="literal">$</tt><em class="replaceable"><tt>n</em></td><td><p><em class="emphasis">n</tt></em>th field in current record;fields are separated by <tt class="literal">FS</tt></p></td></tr><tr><td><tt class="literal">nawk</tt></td><td><tt class="literal">ARGC</tt></td><td><p>Number of arguments on command line</p></td></tr><tr><td> </td><td><tt class="literal">ARGV</tt></td><td><p>An array containing the command-line arguments,indexed from 0 to <tt class="literal">ARGC - 1</tt></p></td></tr><tr><td> </td><td><tt class="literal">CONVFMT</tt></td><td><p>String conversion format for numbers (<tt class="literal">"%.6g"</tt>) (POSIX)</p></td></tr><tr><td> </td><td><tt class="literal">ENVIRON</tt></td><td><p>An associative array of environment variables</p></td></tr><tr><td> </td><td><tt class="literal">FNR</tt></td><td><p>Like <tt class="literal">NR</tt>, but relative to the current file</p></td></tr><tr><td> </td><td><tt class="literal">RLENGTH</tt></td><td><p>Length of the string matched by <tt class="literal">match()</tt> function</p></td></tr><tr><td> </td><td><tt class="literal">RSTART</tt></td><td><p>First position in the string matched by <tt class="literal">match()</tt> function</p></td></tr><tr><td> </td><td><tt class="literal">SUBSEP</tt></td><td><p>Separator character for arraysubscripts (<tt class="literal">"\034"</tt>)</p></td></tr><tr><td><tt class="literal">gawk</tt></td><td><tt class="literal">ARGIND</tt></td><td><p>Index in <tt class="literal">ARGV</tt> ofcurrent input file</p></td></tr><tr><td> </td><td><tt class="literal">ERRNO</tt></td><td><p>A string indicating the error when a redirectionfails for <tt class="literal">getline</tt> or if <tt class="literal">close()</tt>fails</p></td></tr><tr><td> </td><td><tt class="literal">FIELDWIDTHS</tt></td><td><p>A space-separated list of field widths to use for splittingup the record, instead of <tt class="literal">FS</tt></p></td></tr><tr><td> </td><td><tt class="literal">IGNORECASE</tt></td><td><p>When true, all regular expression matches,string comparisons, and calls to <tt class="literal">index()</tt> signore case</p></td></tr><tr><td> </td><td><tt class="literal">RT</tt></td><td><p>The text matched by <tt class="literal">RS</tt>, which can be aregular expression in <tt class="literal">gawk</tt></p></td></tr></table><p><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch11_03.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0" /></a></td><td align="right" valign="top" width="228"><a href="ch11_05.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">11.3. Patterns and Procedures</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0" /></a></td><td align="right" valign="top" width="228">11.5. Operators</td></tr></table></div><hr width="684" align="left" /><img src="../gifs/navbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links" /><p><p><font size="-1"><a href="copyrght.htm">Copyright © 2003</a> O'Reilly & Associates. 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