It's always safest(not sure if it's required) to give opendir an absolute directory name - that is, a directory name with a fully qualified path. Do the "element"s in /Scripts/rotlog have absolute directory names in them?

And, the $name that readdir returns is *NOT* an absolute filename. Therefore, before you try to test $name with a -M filetest operator, you must provide the absolute path to $name - something like this:

my $current_abs_dir = "/path/to/opendir/directory";
while ($name = readdir(REP)) {
    $abs_name = "$current_abs_dir/$name";
    if (-M $abs_name >= 10) {
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If the elements in /Scripts/rotlog do not include the absolute path to the directory, you'll need to get the absolute path to the directory from somewhere.

Read the perldocs for opendir and readdir by doing

   perldoc -f opendir

   perldoc -f readdir
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HTH.