Class methods:
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     atime, basename, blockdev?, catname, chardev?, chmod, chmod, chown,
     compare, copy, ctime, delete, directory?, dirname, executable?,
     executable_real?, exist?, exists?, expand_path, extname, file?,
     fnmatch, fnmatch?, ftype, grpowned?, identical?, install, join,
     lchmod, lchown, link, lstat, makedirs, move, mtime, new, owned?,
     pipe?, readable?, readable_real?, readlink, rename, safe_unlink,
     setgid?, setuid?, size, size?, socket?, split, stat, sticky?,
     symlink, symlink?, syscopy, truncate, umask, unlink, utime,
     writable?, writable_real?, zero?