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PerlNotes version 1 showing authors affecting page license.
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CraigBox |
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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 |
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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: |
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<verbatim> |
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$ PERLDB_OPTS="NonStop=1 AutoTrace=1 frame=2" perl -dS program |
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</verbatim> |
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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: |
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<verbatim> |
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$ perl -d:Trace program |
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</verbatim> |
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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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CategoryNotes |
