I have a file which i run a foreach loop on, then save it. reopen it and remove some dupliacte lines based on certaian fields. how can i run this without the saving and reopening of the file in the middle section each time. 

#!/usr/bin/perl
use strict;
use warnings;
#use diagnostics;

my $file = "c:\\tmp.txt";
open( my $fh, "<", $file ) or die $!;

my $OUTNET = "c:\\NETtmp.txt";
open( OUTPUT, ">", "$OUTNET" ) or die $!;
my @array;
 foreach (<$fh>) {
    chomp ;
        if ( $_ =~ m/^\s+\d/ ) {
        $_ =~ s/^\s+//g;
        $_ =~ s/\s+$//g;
        $_ =~ s/\s+/,/g;
 push @array, "s_";
    print  " $_  \n";
printf OUTPUT "$_  \n";
    }
}
close OUTPUT;              

my $file2 = "c:\\NETtmp.txt";
my $OUTNET2 = "c:\\final.txt";

open my $in,  '<', $file2 or die $!;
open my $out, '>', $OUTNET2 or die $!;
seek $in, 0, 0;
my %hash;
while (<$in>) {
    my $key = join ',', ( split /,/ )[ 1, 2, 3, 4 ];
    printf $out $_ unless $hash{$key}++;
}
close $out;
close $in;

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In reply to Perl script run foreach loop and sort without having to save and reopen the filehandle each time. by john.tm

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