open my $fh => "$tempDir/nbssbaseblds.txt" or die "Open failed: $!\n";
    while (<$fh>) {
        my @parts = split m :/: => (split m /:/) [0]; # Split into path names.
        if ($parts [-1] =~ /^\w+\.bld$/)              # Match on file name.
            ... whatever ...                          # $parts [-3] eq "acn"
            last;
        }
    }