Generally, it is best to be precise about path names.

Some shells can native glob in a case-insensitive way. shopt -s nocaseglob will set that up in bash. Perl's glob is standalone and does not honor bash options. This approach using backticks will be tricky and not very portable.

A perl approach:

sub fileExists {
    my $dir = shift;
    my $file = shift;

    # case insensitive grep on filenames
    my @exists = grep { lc("$dir/$file") eq lc($_) } glob($dir/*);
    # returns an array, you want to know if more than one file matches
}
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This kind of handling is a spot case. It does not set up any global case insensitivity in perl.

After Compline,
Zaxo