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<html><head><title>IPC::Open3 (Perl in a Nutshell, 2nd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Stephen Spainhour" /><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="0596002416L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Perl in a Nutshell, 2nd 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="Java and XSLT" /><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="ch08_134.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="ch08_136.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">8.135. IPC::Open3</h2><p><a name="INDEX-1487" />IPC::Open3 works like IPC::Open2.</p><blockquote><pre class="code">use IPC::Open3;$pid = open3($<em class="replaceable"><tt>wtr</em>, $<em class="replaceable">rdr</em>, $<em class="replaceable">err</em>, $<em class="replaceable">cmd_with_args</tt></em>);$pid = open3($<em class="replaceable"><tt>wtr</em>, $<em class="replaceable">rdr</em>, $<em class="replaceable">err</em>, $<em class="replaceable">cmd</em>, "<em class="replaceable">arg1</em>", "<em class="replaceable">arg2</tt></em>", ...);</pre></blockquote><p>The following differences apply:</p><ul><li><p>The first two arguments(<tt class="literal">$</tt><em class="replaceable"><tt>wtr</tt></em> and<tt class="literal">$</tt><em class="replaceable"><tt>rdr</tt></em>) are passed in theopposite order.</p></li><li><p>A third filehandle can be passed, for standard error. If thisargument is given as "", thenSTDERR and STDOUT for <tt class="literal">$cmd</tt> are on the samefilehandle.</p></li><li><p>If <tt class="literal">$wtr</tt> begins with <tt class="literal"><</tt>, thenthe leading <tt class="literal"><</tt> is stripped from the name, andthe remainder is assumed to be a regular filehandle for an open file,rather than a reference to a typeglob. <tt class="literal">open3</tt> opensthis file as STDIN for <tt class="literal">$cmd</tt> and closes it in theparent. Likewise, if <tt class="literal">$rdr</tt> or<tt class="literal">$err</tt> begins with <tt class="literal">></tt>, then<tt class="literal">$cmd</tt> directs STDOUT or STDERR directly to thatfile rather than to the parent.</p></li></ul><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_134.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="ch08_136.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">8.134. IPC::Open2</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">8.136. IPC::Semaphore</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 © 2002</a> O'Reilly & Associates. All rights reserved.</font></p><map name="library-map"><area shape="rect" coords="1,0,85,94" href="../index.htm"><area shape="rect" coords="86,1,178,103" href="../lwp/index.htm"><area shape="rect" coords="180,0,265,103" href="../lperl/index.htm"><area shape="rect" coords="267,0,353,105" href="../perlnut/index.htm"><area shape="rect" coords="354,1,446,115" href="../prog/index.htm"><area shape="rect" coords="448,0,526,132" href="../tk/index.htm"><area shape="rect" coords="528,1,615,119" href="../cookbook/index.htm"><area shape="rect" coords="617,0,690,135" href="../pxml/index.htm"></map></body></html>⌨️ 快捷键说明
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