View Source: PerlNotes - Waikato Linux Users Group

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This page contains some notes about the [Perl] programming language.  We also have a page of useful PerlOneLiners.

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!! Trace execution in a [Perl] script

Getting a trace showing each executed line of code in sequence (think <tt>sh -x</tt> but for [Perl] scripts) is not obvious. perl(1)'s <tt>-D</tt> switch itself does not provide such functionality, but you can get there like so:

<verbatim>
$ PERLDB_OPTS="NonStop=1 AutoTrace=1 frame=2" perl -dS program
</verbatim>

Another option is to install the [Devel::Trace | http://search.cpan.org/dist/Devel-Trace/] module and simply use it on the script using the <tt>-d:Trace</tt> argument:

<verbatim>
$ perl -d:Trace program
</verbatim>

This does not work everywhere, but is has the advantage that you can easily influence the amount of trace output from within the script. [Perl] developers will therefore probably prefer to use the module.

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Last edited on Friday, May 26, 2006 10:29:22 am by CraigBox

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