Did you even look at the docs for Net::FTP ?

use Net::FTP;

$ftp = Net::FTP->new("some.host.name", Debug => 0);
$ftp->login("anonymous",'-anonymous@');
$ftp->cwd("/pub");
$ftp->get("that.file");
$ftp->quit;
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Should be as easy as that, or if you're doing anonymous ftp access you could use the LWP::Simple module with even greater ease.

use LWP::Simple;

getstore 'ftp://ftp.somedomain.com/somefile.txt',
         'somefile.txt';
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HTH

_________
broquaint