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

if (@ARGV = 2){ 
    my %delList;  
    open my $BEEPON, '>>', "./beepon.file" || die "Can't open beepon.file $!"; 
    open my $BEEPOFF, '>>', "./beepoff.file" || die "Can't open beepoff.file $!"; 
    open my $DELLIST, '<', $ARGV[0] || die "Can't open $ARGV[0] $!"; 
    
    foreach (<$DELLIST>){ 
        chomp($_);
        $delList{$_} = 1; 
    } 
    close $DELLIST; 
    open my $ORGLIST, '<' , $ARGV[1] || die "Cant open $ARGV[1] $!"; 
    
    foreach my $entry (<$ORGLIST>){ 
        chomp($entry);
        print { exists $delList{$entry} ? $BEEPON : $BEEPOFF } $entry . "\n";
    }
close $BEEPON; 
close $BEEPOFF; 
}

##</code><code>##

$./delete_list_ver3.pl test.list test_master.1

readline() on closed filehandle $DELLIST at ./delete_list_ver3.pl line 12.
Use of uninitialized value $ARGV[1] in concatenation (.) or string at ./delete_list_ver3.pl line 17.
Cant open  Bad file descriptor at ./delete_list_ver3.pl line 17.