Where do relative paths fit into your schema? I find I need to distinguish between fully qualified paths and simply qualified paths.

I also find no reason to have to different nomenclature for directory paths and file paths.

I use

fn	File name (no path)
qn	Qualified file name (rel or abs path)
fqn	Fully qualified file name (abs path)
fh	File handle
fhdh	Directory handle

For example,

my $log_fn  = 'log';
my $log_qn  = catfile($log_dir_qn, $log_fn);
my $log_fqn = rel2abs($log_qn);
open(my $log_fh, '<', $log_qn);

my $log_dir_fn  = 'log';
my $log_dir_qn  = catdir($app_dir_qn, $log_fn);
my $log_dir_fqn = rel2abs($log_dir_qn);
opendir(my $log_dir_dh, $log_dir_qn);
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Update: Fixed copy and paste error where "fh" appeared where "dh" should have been.