Search notes:

Oracle: DBA_DIRECTORIES

dba_directories lists all directories.
This view comes in the three variants dba_directories, all_directories and cdb_directories.
declare
   syml  pls_integer;
begin

   for dir in (
       select
          directory_name name,
          directory_path path
       from
          dba_directories
       order by
          lower(directory_path)
   )
   loop

       dbms_output.put_line(
          rpad(dir.name,  31) ||
          rpad(dir.path, 100) ||
          case when dbms_utility.directory_has_symlink(dir.name) =
                    dbms_utility.has_symlink then 'symlink'
                                             else 'nosymlink'
          end
       );

   end loop;
end;
/   

See also

data dictionary

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