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.
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