One question: do you have specific file names to check or are you looking to see if a given directory has two file names which differ only in case?
In either case, I'd just open (with opendir) and read (using readdir) the directory of interest. In the first, I'd just do something like this:
if(scalar( grep { /^$infile$/i } readdir<$dirname>) > 1)
{
raise_a_flag();
}
and in the second, I'd walk through the readdir output and use a hash, with the upcased or downcased file name as the hash key, and raise a flag when there is a duplicated key.
Warning: example code only. Almost certainly guaranteed not to work.
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