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Have made a few modifications:

use strict; use warnings; my ( @header, %hash ); my @files = qw/File1.txt File2.txt/; local $, = "\t"; for my $file (@files) { open my $fhIN, '<', $file or die $!; while ( my $line = <$fhIN> ) { my @columns = split ' ', $line; if ( $. == 1 ) { @header = @columns; } else { push @{ $hash{ $header[$_] } }, $columns[$_] for 0 .. $#co +lumns; } } close $fhIN; for my $key ( keys %hash ) { if ( $key =~ /^dataS\d\dR\d$/ ) { print $key, @{ $hash{$key} }, "\n"; } } undef %hash; }

All columns are kept. After the script has processed a file's lines, it iterates through the hash keys. Note that a regex attempts to match the heading pattern for the columns you're interested in processing. Now, when there a match, it just prints the key and the associated list of values.

In reply to Re^3: How to add column into array from delimited tab file by Kenosis
in thread How to add column into array from delimited tab file by hellohello1

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