Thanks a lot graff for the help!

1. file encoding is : utf-8
2. How to open zipped file with encoding?

I've written my code, review it & let me know my mistakes.
1. I've read cat file into %catHash
2. opened the main file from which I've to extract line if exists in cat file.
3. if $line17 doesn't have value, $line14 value to be used; if both don't have, then read next line. Am I right below?
4. $line17 & $line14 in main file, some have leading 0's but not in that value in cat file. for example: cat file value: 101010100 & main file has: 0101010100
What do you suggest to handle this situation. I've tried replacing these leading 0's.

I'm new to perl & programming both, please help.

#!/usr/bin/perl

use strict;

my $f = "vc_20151003_1.zip";
my $cat = "5426085.csv";
my $file = $f;
my $file =~ s/.zip/.csv/;

## Read the cat file into hash
%catHash = ();
open(CAT, $cat) ||      die "$cat couldn't be opened\n";
while(<CAT>)    {
        @line = split /,/;
        $catHash{$line[1]}++;
}
close(CAT);

open(OUT, ">".$file)    ||      "$file couln't be opened for write\n";
open(IN,sprintf("zcat %s |",  $f)) || die "Could not open pipe for $f 
+: $!";

while(<IN>)     {
        chomp;
        my @line = split /\t/;
        $line[17] =~ s/^0+//;
        $line[14] =~ s/^0+//;

        if(exists($catHash{$line[17]}) || exists($catHash{$line[14]}))
+  {
                print OUT join("\t", @line) . "\n";
        }
        else    { next; }
}
close(IN);
close(OUT);
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