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<html><head><title>Conventions Used in This Book (Programming Perl)</title><!-- STYLESHEET --><link rel="stylesheet" type="text/css" href="../style/style1.css"><!-- METADATA --><!--Dublin Core Metadata--><meta name="DC.Creator" content=""><meta name="DC.Date" content=""><meta name="DC.Format" content="text/xml" scheme="MIME"><meta name="DC.Generator" content="XSLT stylesheet, xt by James Clark"><meta name="DC.Identifier" content=""><meta name="DC.Language" content="en-US"><meta name="DC.Publisher" content="O'Reilly & Associates, Inc."><meta name="DC.Source" content="" scheme="ISBN"><meta name="DC.Subject.Keyword" content=""><meta name="DC.Title" content="Conventions Used in This Book"><meta name="DC.Type" content="Text.Monograph"></head><body><!-- START OF BODY --><!-- TOP BANNER --><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home"><map name="banner-map"><AREA SHAPE="RECT" COORDS="0,0,466,71" HREF="index.htm" ALT="Programming Perl"><AREA SHAPE="RECT" COORDS="467,0,514,18" HREF="jobjects/fsearch.htm" ALT="Search this book"></map><!-- TOP NAV BAR --><div class="navbar"><table width="515" border="0"><tr><td align="left" valign="top" width="172"><a href="ch00_06.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0"></a></td><td align="center" valign="top" width="171"><a href="ch00_01.htm">Preface</a></td><td align="right" valign="top" width="172"><a href="ch00_08.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0"></a></td></tr></table></div><hr width="515" align="left"><!-- SECTION BODY --><h2 class="sect1">0.7. Conventions Used in This Book</h2><p>Some of our conventions get larger sections of their very own.Coding conventions are discussed in <a href="ch24_03.htm#ch24-sect-ps">Section 0.3, "Programming with Style"</a> in <a href="ch24_01.htm">Chapter 24, "Common Practices"</a>. In a sense,our lexical conventions are given in the Glossary (our lexicon).</p><p>The following typographic conventions are used in this book:</p><dl><dt><b><em class="emphasis">Italic</em></b></dt><dd><p>is used for URLs, manpages, pathnames, and programs. New termsare also italicized when they first appear in the text. Many ofthese terms will have alternative definitions in the Glossary ifthe one in the text doesn't do it for you.</p></dd><dt><b><tt class="literal">Constant width</tt></b></dt><dd><p>is used in examples and in regular text to show any literal code. Datavalues are represented by <tt class="literal">constant width</tt> in quotes(""), which are not part of the value.</p></dd><dt><b><tt class="userinput"><b>Constant width bold</b></tt></b></dt><dd><p>is used for command-line switches. This allows one to distinguish forexample, between the <span class="option">-w</span> warnings switch and the<tt class="literal">-w</tt> filetest operator. It is also used in the examplesto indicate the text you type in literally.</p></dd><dt><b><em class="replaceable">Constant width italic</em></b></dt><dd><p>is used for generic code terms for which you must substituteparticular values.</p></dd></dl><p>We give lots of examples, most of which are pieces of code thatshould go into a larger program. Some examples are complete programs,which you can recognize because they begin with a <tt class="literal">#!</tt> line. Westart nearly all of our longer programs with:<blockquote><pre class="programlisting">#!/usr/bin/perl</pre></blockquote>Still other examples are things to be typed on a command line.We've used <tt class="literal">%</tt> to indicate a generic shell prompt:<blockquote><pre class="programlisting">% <tt class="userinput"><b>perl -e 'print "Hello, world.\n"'</b></tt>Hello, world.</pre></blockquote>This style is representative of a standard Unix command line, wheresingle quotes represent the "most quoted" form. Quoting and wildcardconventions on other systems vary. For example, many command-lineinterpreters under MS-DOS and VMS require double quotes instead ofsingle quotes when you need to group arguments with spaces orwildcards in them.</p><!-- BOTTOM NAV BAR --><hr width="515" align="left"><div class="navbar"><table width="515" border="0"><tr><td align="left" valign="top" width="172"><a href="ch00_06.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0"></a></td><td align="center" valign="top" width="171"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0"></a></td><td align="right" valign="top" width="172"><a href="ch00_08.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0"></a></td></tr><tr><td align="left" valign="top" width="172">0.6. Additional Resources</td><td align="center" valign="top" width="171"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0"></a></td><td align="right" valign="top" width="172">0.8. Acknowledgments</td></tr></table></div><hr width="515" align="left"><!-- LIBRARY NAV BAR --><img src="../gifs/smnavbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links"><p><font size="-1"><a href="copyrght.htm">Copyright © 2001</a> O'Reilly & Associates. All rights reserved.</font></p><map name="library-map"> <area shape="rect" coords="2,-1,79,99" href="../index.htm"><area shape="rect" coords="84,1,157,108" href="../perlnut/index.htm"><area shape="rect" coords="162,2,248,125" href="../prog/index.htm"><area shape="rect" coords="253,2,326,130" href="../advprog/index.htm"><area shape="rect" coords="332,1,407,112" href="../cookbook/index.htm"><area shape="rect" coords="414,2,523,103" href="../sysadmin/index.htm"></map><!-- END OF BODY --></body></html>⌨️ 快捷键说明
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