I would make two suggestions regarding this chunk:

my @list = glob("$home/*.$type");
foreach my $file (@list) 
{
   my $result = `mv $file $home/$basedir/$key`;
}
$type = uc($type);
@list = glob("$home/*.$type");
foreach $file (@list)
{
   $result = `mv $file $home/$basedir/$key`;
}
[download]

First, there's a lot of repetition there that can be removed by setting your @list variable to the "concatenation" of the lists returned by the glob. Second, you grab $result but you never check whether the move was successful! I'd think about rewriting the chunk above as:

foreach my $file (glob("$home/*.$type"), glob("$home/*.\U$type")) 
{
   system('mv', $file, "$home/$basedir/$key") == 0 or
      warn "Could not move $file: $!";
}
[download]

(the \U modifier does the uc translation within double quoted strings).

Also, you could do to a test for existence of directories (-d $dirname, I believe) and create those on the fly rather than forcing their existence beforehand, something like

system('mkdir', '-p', "$home/$basedir/$key") 
   unless -d "$home/$basedir/$key";
[download]

Here I presume a *nix environment, which seems likely given your earlier use of 'mv'. Natch, you should test the return value of that system call, too....

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