G'day shabird,

Welcome to the Monastery.

You've posted your input data twice. Working past that, is it really double-spaced as you've shown? The output from your 'print $line,"\n";' would have been useful for us; however, you've commented that out.

There's another bigger problem. You said "its not printing anything". The code you posted would have printed something like: 

Global symbol "@keys" requires explicit package name ...
Execution ... aborted due to compilation errors.

[download]

For future reference, please

If you had made a mistake by trying to split on non-existent colons, you still would have got the keys but the values would have been all undef. Here's a quick example: 

$ perl -e '
    my $x = "MIR200B miRNA";
    my %h;
    my ($k, $v) = split /:/, $x;
    $h{$k} = $v;
    use Data::Dumper;
    print Dumper(\%h);
'
$VAR1 = {
          'MIR200B miRNA' => undef
        };

[download]

Given there's so many question marks over the data and the code, it's difficult to advise you. The following may be close to what you were trying achieve; or, at least, provide some insight into how you might proceed. 

#!/usr/bin/env perl

use strict;
use warnings;

my %data;

while (<DATA>) {
    next if $. == 1;
    chomp;
    next unless length;
    my ($k, $v) = split;
    $data{$k} = $v;
}

# To test result
use Data::Dumper;
print "*** Hash ***\n";
print Dumper(\%data);
print "*** Keys ***\n";
print "$_\n" for keys %data;
print "*** Values ***\n";
print "$_\n" for values %data;

__DATA__
GeneName    GeneType

APOL4   protein_coding

CYP2C8  protein_coding

NAALADL2    protein_coding

NANOS3  protein_coding

C20orf204   protein_coding

MIR429  miRNA

MIR200A miRNA

MIR200B miRNA

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Output:

*** Hash ***
$VAR1 = {
          'NANOS3' => 'protein_coding',
          'C20orf204' => 'protein_coding',
          'APOL4' => 'protein_coding',
          'MIR429' => 'miRNA',
          'NAALADL2' => 'protein_coding',
          'MIR200B' => 'miRNA',
          'MIR200A' => 'miRNA',
          'CYP2C8' => 'protein_coding'
        };
*** Keys ***
NANOS3
C20orf204
APOL4
MIR429
NAALADL2
MIR200B
MIR200A
CYP2C8
*** Values ***
protein_coding
protein_coding
protein_coding
miRNA
protein_coding
miRNA
miRNA
protein_coding

[download]

— Ken

In reply to Re: Getiing keys or values of a file based hash by kcott
in thread Getiing keys or values of a file based hash by shabird

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