I started out looking to create unique filenames, that during a later stage of the processing, I could differentiate from those created by other runs of the code, via globbing, .

Once sundialsvc4 suggested using a directory--which hadn't crossed my mind earlier--using a temporary directory and creating all my files within it make perfect sense.

I'm not sure that module buy me anything useful over something like:

my $path = $ENV{ TMP };
my $dir = 'temp' . join'', map{ ('A'..'Z')[rand 26] } 1 .. 4;
++$dir until mkdir $path . $dir or $! != 17 and die "$path$dir : $!;
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But I guess that depends whether this code will ever make it to another platform. I don't see that ever happening.