UUID_UNPARSE(3) UUID_UNPARSE(3) uuid_unparse - UUID #include void uuid_unparse(const uuid_t uu, char *out); void uuid_unparse_upper(const uuid_t uu, char *out); void uuid_unparse_lower(const uuid_t uu, char *out); uuid_unparse() UUID uu 36 ( '\0' ) 1b4e28ba-2fa1-11d2-883f-0016d3cca427 out. uuid_unparse() . uuid_unparse_upper() uuid_unparse_lower(). UUID OSF DCE 1.1. Theodore Y. Ts'o uuid(3) uuid_clear(3) uuid_compare(3) uuid_copy(3) uuid_generate(3) uuid_time(3) uuid_is_null(3) uuid_parse(3) . libuuid util-linux 2.15.1. . util-linux 2.42.1 2026-05-18 UUID_UNPARSE(3)