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Re: [PBML] file handler

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  • Hema K
    Thank you! I m very new to Perl and whether %hash = `ls -ltr` is useless or not, I just came up with an example to use backtick. I just realized that print
    Message 1 of 3 , Jan 26, 2011
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      Thank you! I'm very new to Perl and whether %hash = `ls -ltr` is useless or
      not, I just came up with an example to use backtick. I just realized that
      print FILE " "; will send the output to FILE(or whatever FH I use) rather
      than to STDOUT. That was my question.


      On Wed, Jan 26, 2011 at 4:41 PM, Randal L. Schwartz
      <merlyn@...>wrote:

      > >>>>> "Hema" == Hema K <khema1808@...> writes:
      >
      > Hema> open(FILE, "+>output.txt");
      >
      > You should verify that this succeeds:
      >
      > open FILE, ">output.txt" or die "Cannot create output.txt: $!";
      >
      > Hema> %hash = `ls -ltr`;
      >
      > This will assign alternate lines as keys and values in the hash. Pretty
      > useless. Not only that, but the newlines are preserved.
      >
      > Hema> @array = %hash;
      >
      > This randomly extracts key/value pairs from the hash, turning them into
      > an array.
      >
      > Hema> print "@array \n";
      >
      > This inserts spaces between the elements, causing all but the first line
      > to be indented, since you've preserved the newlines above. And this
      > also goes to STDOUT, not to FILE.
      >
      > Hema> close FILE;
      >
      > This is the only line that might be correct, although in most programs I
      > write, I never close the filehandle.
      >
      > Your code is a mishmash. I suggest instead of generating "blender perl"
      > where you throw a bunch of random things into a file without
      > understanding what they do, that you instead proceed in an orderly
      > manner through any of the many tutorials recommend by sites like
      > http://learn.perl.org In the long run, you'll waste less of your time,
      > and less of ours.
      >
      > --
      > Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
      > <merlyn@...> <URL:http://www.stonehenge.com/merlyn/>
      > Smalltalk/Perl/Unix consulting, Technical writing, Comedy, etc. etc.
      > See http://methodsandmessages.posterous.com/ for Smalltalk discussion
      >


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