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Re^3: Parse a file into a hash

by aaron_baugher (Deacon)
on Apr 05, 2012 at 22:19 UTC ( #963755=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Parse a file into a hash
in thread [Resolved] Parse a file into a hash

You should probably show us some sample data, so we can tell what "can't detect a key" means. But in general, you're talking about creating a hash of arrays. So for every key/value pair, you'll want to do something like this:

push @{$stack{$key}}, $value;

That pushes the value onto the array referenced by the key within the hash. Later, you'll be able to go through them with:

for my $key (keys %stack){ for my $value (@{$stack{$key}}){ # do stuff with $key and $value } }

Aaron B.
My Woefully Neglected Blog, where I occasionally mention Perl.


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Re^4: Parse a file into a hash
by kazak (Beadle) on Apr 06, 2012 at 14:50 UTC
    Thanks for your reply. I don't know how to preserve initial format of the file here, so I'll replace empty cells of.csv with null.

    Username; Asset Name

    Corinna Mayer;JKDef4574

    Janek Huska;NAdf8f48g5

    Eric Shtits;JSd5345kPFl

    null;A878rfgP56

    null;KDLefrtgt

    Erik Fisher;UiO8trve

    As you can see Eric Shtits owns 3 asset names in according to this .csv file, so two fields that supposed to be keys are empty.And I need to implement a solution that will be able to detect that all three asset names belong to one person. Regards, Kazak

      hi check if this code works or not its not tested.

      my ($key,$val,$keyprev); open(fh,'< file.txt'); while (<fh>){ $keyprev=$key; ($key,$val)=split /\;/, $_; $key=$keyprev if($key eq""); print "$key :: $val\n"; } close fh;

        Yes it helped. Thanks to everyone.

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