Laurent_R, GotToBTru thanks a lot to both of you for pointing out mistakes in my code. I don't know how could I not notice them before. I have followed your advices to edit the code and also edited few other things and now it works as expected. 


#!/usr/bin/env perl
use strict;
use warnings;
use File::Basename;
my $lab_root = dirname $0;

opendir( DH, $lab_root) or die "Cannot open $lab_root: $!\n";
my @kickstarts = grep ( /\.ks$/, readdir(DH));

my @bsname ;
my @predefined;
my $hostname;
for my $kickstart (@kickstarts) {
    open my $fh, $kickstart or die "Cannot open $kickstart: $!";

    while (<$fh>) {
        chomp;
        if ( /(?s)^((?!#).)*--hostname=/ ) {
            my @fields = split /[=\s]/;
            $hostname = $fields[1];
            push @bsname , $hostname;
            push @predefined , $kickstart;
        }
    }
    close $fh;
    next if $kickstart ~~ @predefined;

    $hostname = (split /\./, $kickstart )[0];
    push @bsname, $hostname;
}

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In reply to Re^2: If line matches, print column, else print file name by Yakup
in thread If line matches, print column, else print file name by Yakup

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