Generate dynamic file name list - perl

Question

I started programming in perl few months back and this is my first question on stackoverflow.com. I hope I can get a solution.
So I want to copy some files from an ftp server. The file names are in this format:
abc_201149_cde_07_fgh_include_internal
In this example the numeric part gets changed on weekly basis, e.g. 201149 says year = 2011 and week = 49. Similarly, 07 says which version it is.
I have copied all the file names into one file called "sdk_link.txt" and I am reading each file name from this and then copying to my local PC:
use Net::FTP;
use File::Copy;
$Login = "<redacted>";
$Pwd = "<redacted>";
$ftpHost = "<redacted>";
$ftpFolder = "/daj/dhakj/ahdakl/abc_201206_def_05";
$ftp=Net::FTP->new($ftpHost,Timeout=>100);
if ($ftp)
{
print $ftp->message;
}
$ftp->login($Login,$Pwd);
print $ftp->message;
$ftp->cwd($ftpFolder);
print $ftp->message;
open FILE,"sdk_link.txt" or die $!;
while($test=<FILE>)
{
chomp($test);
#Copy the file
copy("$test","/testing");
}
$ftp->quit;
I want to run this script every week on Windows. How can I make the numeric part change so that the correct files get downloaded?

Answer 1

Well, the obvious answer is to keep a template on file, and insert the correct numbers. For example:
echo abc_%s_cde_%s_fgh_include_internal |
perl -MPOSIX -nE 'say sprintf $_, strftime("%Y%U", localtime()), "07";'
Output:
abc_201207_cde_07_fgh_include_internal
So that if you'd have a file with templates, you can use %s to insert strings, and provide arguments either from your own list of arguments, or dynamically, as you prefer. E.g.:
my $year = "2011";
my $week = "49";
my $ver = "07"; # Strings or numbers does not really matter
open my $fh, '<', "sdk_link.txt" or die $!;
while (<$fh>) {
my $file = sprintf $_, $year, $week, $ver;
copy($file, "/testing") or die "Copy failed for file $file: $!";
}
I am not so sure File::Copy::copy works as intended for remote files, but that's another question. I believe Net::FTP::get() might be what you want.