As Abigal-II has pointed out, not all FTP servers support transmitting file modification times, and the ones that do may not even transmit them in the same format. I think you have two options:

• Write a client-side script to parse the output of "ls -l" and grab the latest file
• Write a server-side script that symlinks the latest file to a known filename, such as "latest"

Here's some example code for the second way of doing things. Some example code is shown below:

#!/usr/bin/perl -w

use strict;
my $ftp_dir = '/pub/';
my @files = glob("$ftp_dir/*");

my ($latest_file,$modtime) = (0,0);
foreach my $file (@files) {
   my $local_modtime = (stat($file))[9];
   if ( $local_modtime > $modtime ) {
      $latest_file = $file;
      $modtime = $local_modtime;
   }
}

# There's probably a better way to make symlinks
`ln -s $ftp_dir/$latest_file $ftp_dir/latest`;
[download]

The code is untested, but hopefully it can get the point across.

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