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Predicate file_directory_name/2
Availability:built-in
file_directory_name(+File, -Directory)
Extracts the directory part of File. This predicate removes the longest match for the regular expression /*[^/]*/*$. If the result is empty it binds Directory to / if the first character of File is / and . otherwise. The behaviour is consistent with the POSIX dirname program.154Before SWI-Prolog 7.7.13 trailing / where not removed, translation /a/b/ into /a/b. Volker Wysk pointed at this incorrect behaviour.

See also directory_file_path/3 from library(filesex). The system ensures that for every valid Path using the Prolog (POSIX) directory separators, following is true on systems with a sound implementation of same_file/2.155On some systems, Path and Path2 refer to the same entry in the file system, but same_file/2 may fail. See also prolog_to_os_filename/2. 

        ...,
        file_directory_name(FilePath, Dir),
        file_base_name(FilePath, File),
        directory_file_path(Dir, File, Path2),
        same_file(FilePath, Path2).
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