my $pat = $line =~ m/^LOC_Os0[1-7]g[0-9]*.[0-9]\s/;

##</code><code>##

    my ($pat) = $line =~ m/^LOC_Os0[1-7]g[0-9]*.[0-9]\s/;

##</code><code>##

#!/usr/local/bin/perl
use strict;
use warnings;
use autodie;

open (FILE,  "<:utf8", "outputps_scan_chr1_.out");

my %seen = ();

open (MYFILE, ">:utf8", "data.txt");
open (WASTE, ">:utf8", "waste.txt");

while (defined(my $line = <FILE>))
{
    my $pat;
    next if ($line !~ m/^(LOC_Os0[1-7]g[0-9]*.[0-9])\s/);
    $pat = $1;
    if (!$seen{$pat}++)
    {
        print MYFILE $line;
    }
    else
    {
        print WASTE $line;
    }
}
close (MYFILE);
close (WASTE);
close (FILE);