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<html><head><title>File::Find (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="File::Find"><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="ch32_20.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0"></a></td><td align="center" valign="top" width="171"><a href="ch32_01.htm">Chapter 32: Standard Modules</a></td><td align="right" valign="top" width="172"><a href="ch32_22.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">32.21. File::Find</h2><p><blockquote><pre class="programlisting">use File::Find;# Print out all directories below current one.find sub { print "$File::Find::name\n" if -d }, ".";# Compute total space used by all files in listed directories.@dirs = @ARGV ? @ARGV : ('.');my $sum = 0;find sub { $sum += -s }, @dirs;print "@dirs contained $sum bytes\n";# Alter default behavior to go through symlinks# and visit subdirectories first.find { wanted => \&myfunc, follow => 1, bydepth => 1 }, ".";</pre></blockquote>The <tt class="literal">File::Find</tt> module's <tt class="literal">find</tt> function recursively descendsdirectories. Its first argument should be a reference to a function,and all following arguments should be directories. The function iscalled on each filename from the listed directories. Within thatfunction, the <tt class="literal">$_</tt> variable is set to the basename of the currentfilename visited, and the process's current working directory is bydefault set to that directory. The package variable<tt class="literal">$File::Find::name</tt> is the full pathname of the visited filename. Analternative calling convention takes as its first argument a referenceto a hash containing option specifications, including "<tt class="literal">wanted</tt>","<tt class="literal">bydepth</tt>", "<tt class="literal">follow</tt>", "<tt class="literal">follow_fast</tt>", "<tt class="literal">follow_skip</tt>","<tt class="literal">no_chdir</tt>", "<tt class="literal">untaint</tt>", "<tt class="literal">untaint_pattern</tt>", and"<tt class="literal">untaint_skip</tt>", as fully explained in the online documentation.This module is also used by the standard <em class="emphasis">find2perl</em>(1) translatorprogram that comes with Perl.</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="ch32_20.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="ch32_22.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0"></a></td></tr><tr><td align="left" valign="top" width="172">32.20. File::Copy</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">32.22. File::Glob</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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