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For development- or debugging-purpose I like to use something like the following piece of code:

# somewhere at the beginning of the code $SIG{__WARN__} = \&Warning; $SIG{__DIE__} = \&Die; # anywhere # ------------------------------------------------------------ sub Warning { my @text = @_; warn "------------------------------------------------------------ +\n"; warn "WARNING: @text\n"; my $count = 0; { my ($package, $filename, $line, $sub) = caller($count); last unless defined $line; warn sprintf("%02i %5i %-35s %-20s\n", $count++, $line, $sub, $filename); redo; } } # Warning # ------------------------------------------------------------ sub Die { my @text = @_; warn "------------------------------------------------------------ +\n"; warn "FATAL ERROR: @text\n"; my $count = 0; { my ($package, $filename, $line, $sub) = caller($count); last unless defined $line; warn sprintf("%02i %5i %-35s %-20s\n", $count++, $line, $sub, $filename); redo; } exit 1; } # Die # ------------------------------------------------------------

This installs "signal handlers" for die and warn which are executed every time when the functions die and warn are executed and print a backtrace on how the line the warning or die was produced was reached...

Best regards,
perl -e "s>>*F>e=>y)\*martinF)stronat)=>print,print v8."

In reply to Re: Perl debug. How do I find calling line number? by strat
in thread Perl debug. How do I find calling line number? by brycen

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    [LanX]: but but but ... the errors are nicely formatted!
    [tye]: 1) The python stack traces show you the names of variables, not the values of variables. Almost never informative.
    [LanX]: do you have a py job now?
    [tye]: Right now I have errors trying to fetch stuff from graphite. It says 'apps not ready, check startup logs'. I eventually find the startup logs and see 'no apps found'. Looking for fixes to this problem...
    [LanX]: no idea ... ask py monks! ;-p
    [tye]: it turns out that this can be caused by almost anything going wrong. If you want to know what caused the problem, you have to try to load each app by-hand to see what problems it is having, because none of those will be logged.
    [tye]: No, I write more Perl than py at work. But I have to deal with plenty of py things.
    [tye]: py monks would just be offended.
    [Corion]: ;)
    [Corion]: Hi tye btw ;)

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