I found a piece of old code that I had written that goes to an FTP site and retrieves a file via LWP::Simple:

my $data   = get('ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.gz')
+;
my $outfile = '>GO_TERMS.CSV';

if (!$data) {
    exit();
    }

open(OUT, '>LL_tmpl.gz');
binmode OUT;
print OUT $data;
close(OUT);
[download]

I thought: hey, that's silly because it loads the whole file into a variable. Why not rewrite it with Net::FTP? That should be shorter, clearer code, as well as much faster.

use Net::FTP;

my $ftp = Net::FTP->new('ftp.ncbi.nih.gov', Debug=>0);

$ftp->login('anonymous', 'anon@anon.com');
$ftp->cwd('/refseq/LocusLink/');
$ftp->type('binary');
$ftp->get('LL_tmpl.gz');
$ftp->quit();
[download]

The problem is, when I run the file downloaded via Net::FTP through a gzip -t it indicates a corrupt archive. When I get it from LWP::Simple, the archive seems valid. I've reproduced this on a couple of machines, but they are all behind the same router: can anyone validate this from other machines? Any ideas what's causing the FTP download to be invalid?

-Tats

Update: Warning! The downloaded file is rather large ~30 MB. (thanks for point it out b10m)

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