But second for loop doing it does not produce any output

I don't see where you output anything.

I also don't know the format of the data structure, so there's no way to know if any of what you are doing makes sense. I mean, it looks plausible, but you're saying there's some problem. Please specify what the problem is, and show us your data structure (using Data::Dumper and print(Dumper(\@a));, and/or by showing create_hash_for_filename).

Some side notes: 

my %b;
create_hash_for_filename($filename,\%b);
push @a, {%b};

[download]

It would make more sense if create_hash_for_filename returned a hash ref. 

sub create_hash_for_filename {
   my %b;
   ...
   return \%b;
}

push @a, create_hash_for_filename($filename);

[download]

for (my $i=0;$i<10;$i++)

How about 

for my $i (0..9)

[download]

In reply to Re: array of hashes question by ikegami
in thread array of hashes question by jimmy78

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