On Win32 and Linux, this test program shows that clobbering will happen. 
use strict;
use warnings;

my $file1 = 'file1.dat';
my $file2 = 'file2.dat';
for my $file ( $file1, $file2 ) {
  open my $fh, '>', $file or die;
  print {$fh} "Test data for file '$file'\n";
  close $fh or warn;
}
rename $file1, $file2 or die;

[download]
Output: Produces only one file, named `file2.dat`, containing "Test data for file1.dat"

In reply to Re^3: Renaming a group of files occassionally deletes some by Util
in thread Renaming a group of files occassionally deletes some by coldfingertips

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