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how to find the value of variable?

by Divakar (Sexton)
on Aug 10, 2012 at 10:28 UTC ( #986713=perlquestion: print w/replies, xml ) Need Help??
Divakar has asked for the wisdom of the Perl Monks concerning the following question:

i dont know how to find the value of variable while debugging. for e.g.,

DB<13> x $fh 0 FileHandle=GLOB(0x59fe84) -> FileHandle({*Symbol::GENO}) => fileno(3) DB<14>

i want to know how i can see the variable $fh.

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Re: how to find the value of variable?
by aitap (Curate) on Aug 10, 2012 at 11:20 UTC
    To your mind, what value should filehandle variable have? If you want to know the file name of the filehandle, you'll have to use IO::File::WithPath, IO::File::WithFilename or something like this.
    Sorry if my advice was wrong.
      I think this is right. Typically once the file system has opened a file, it doesn't care nor keep track of the text string that was used to open the file in the first place.

      So, if the OP means "what was the text file "name/path" for this filehandle?, the user program would have to keep track of that name/path which is what these modules appear to do. There are weird sorts of situations that can arise, but it doesn't sound like further elaboration is needed.

      As a practical debugging matter, I would just add a print statement with that info for debugging or make a log entry of some sort. Or print the $name that was used in the open() in the debugger rather than trying to make sense of the filehandle structure.

Re: how to find the value of variable?
by rpnoble419 (Pilgrim) on Aug 10, 2012 at 13:23 UTC

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