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<html><head><title>Customizing the Debugger (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="ch06_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="ch06_05.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">6.4. Customizing the Debugger</h2><p><a name="INDEX-1170" /><a name="INDEX-1171" /><a name="INDEX-1172" /><a name="INDEX-1173" />You can dosome customizing by setting up a <em class="emphasis">.perldb</em> filewith initialization code. When it starts up, the debugger reads andprocesses this file. For instance, you can set up aliases such asthese:</p><blockquote><pre class="code">$DB::alias{'len'} = 's/^len(.*)/p length($1)/';$DB::alias{'stop'} = 's/^stop (at|in)/b/';$DB::alias{'ps'} = 's/^ps\b/p scalar /';$DB::alias{'quit'} = 's/^quit\b.*/exit/';</pre></blockquote><p>You can also use this file to set options and define a subroutine,<tt class="literal">&afterinit</tt>, to be executed after the debuggeris initialized.</p><p>After the configuration file has been processed, the debuggerconsults the environment <a name="INDEX-1174" />variable PERLDB_OPTS and parses itscontents as arguments to the <tt class="literal">O</tt><tt class="literal">opt=val</tt> debugger command.</p><p>While any options can be set in PERLDB_OPTS, the following optionscan <em class="emphasis">only</em> be specified at startup. If you want toset them in your configuration file, call<tt class="literal">&parse_options("opt=val")</tt>.</p><dl><dt><b><tt class="literal">TTY</tt></b></dt><dd><a name="INDEX-1175" />TheTTY to use for debugging I/O.</p></dd><dt><b><tt class="literal">noTTY</tt></b></dt><dd><a name="INDEX-1176" />If set, goes in NonStop mode. Onan interrupt, if TTY is not set, it uses the value of<tt class="literal">noTTY</tt> or <em class="emphasis">/tmp/perldbtty$$</em> tofind the TTY using Term::Rendezvous. The current variant is to havethe name of the TTY in this file.</p></dd><dt><b><tt class="literal">ReadLine</tt></b></dt><dd><a name="INDEX-1177" />If false, a dummy<tt class="literal">ReadLine</tt> is used so you can debug ReadLineapplications.</p></dd><dt><b><tt class="literal">NonStop</tt></b></dt><dd><a name="INDEX-1178" />If true, no interaction isperformed until an interrupt.</p></dd><dt><b><tt class="literal">LineInfo</tt></b></dt><dd><a name="INDEX-1179" />File or pipe to print line numberinformation to. If it's a pipe, then a short,<em class="emphasis">emacs</em>-like message is used.</p></dd></dl><p>For example, if you create the following <em class="emphasis">.perldb</em>file:</p><blockquote><pre class="code">&parse_options("NonStop=1 LineInfo=db.out");sub afterinit { $trace = 1; }</pre></blockquote><p>your script will run without human intervention, putting traceinformation into the file <em class="emphasis">db.out</em><a name="INDEX-1180" /><a name="INDEX-1181" /><a name="INDEX-1182" /><a name="INDEX-1183" /><a name="INDEX-1184" />.</p><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch06_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="ch06_05.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">6.3. Using the Debugger</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">6.5. The Perl Profiler</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. 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