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Re: Debugger Tutorials

by VSarkiss (Monsignor)
on Jun 14, 2001 at 00:01 UTC ( #88193=note: print w/replies, xml ) Need Help??


in reply to Debugger Tutorials

I echo bikeNomad's recommendation of the Linux Journal article (I don't think the Monastery's article is as good. YMMV).

What really made me start making better use of the debugger is Effective Perl Programming by Hall and Schwartz. One of their recommendations I liked best was to use the debugger as an interactive Perl environment. That is, just type: perl -d -e 0
and any Perl you enter at the prompt will be executed. Combine this with the debugger's x command, and you have a nice way of, for example, analyzing data structures.

Don't be overwhelmed by the ton of commands that appear in the help. I hardly ever use more than these:

  • x: nicely formatted display of any variable: scalar, array, or hash
  • p: print the argument, like the built-in
  • w: show a 10-line window around the current line.
  • s and n: step the program, optionally stepping over an entire sub
  • b: break execution at line
  • c: continue executing until reaching line
  • q: quit (kinda necessary, that one)
As others have pointed out in this thread, it won't help if your program won't compile. But that's true of debuggers for any compiled language.

HTH

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[marto]: in 3 years I may be able to go :P
[Corion]: choroba: Both teams will ponder on whether/where/how to organize things. The workshop will be mainly in German though
[Corion]: marto: Hehe ;)
[marto]: my out of working hours time is very scarce at the moment
[marto]: unfortunately for you guys I can still access PM during the day :P
[Corion]: marto: Ow, I hope that gets better soonish! But I feel some $work-timecrunch looming at my $work as well
[Corion]: marto: Ah, so you can multiplex work and PM time ;-D
[Corion]: The upside to this is that I've reduced my $work (well, $paid) time to 80%, so I'll be at $work only four days/week, which will hopefully make the crunch less crunchy on me ;)
[marto]: yeah, so that stays as before. But before the boys were born I'd be on quite often at night (GMT) also
[marto]: I had the option during our TUPE transfer to buy 5 more days holiday. They were shocked when I did :P

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