+command_ret_t do_env(cmd_tbl_t *, uint_fast8_t, int, char * const []);
+int env_init(void);
+char *getenv_str(const MEMX char *name);
+unsigned long getenv_ulong(const MEMX char *name, int base, unsigned long default_val);
+bool getenv_yesno(const MEMX char *name);
+int setenv(const MEMX char *varname, const char *varvalue);
+int setenv_ulong(const MEMX char *varname, unsigned long value);
+int setenv_hex(const MEMX char *varname, unsigned long value);
+
+#if defined(CONFIG_AUTO_COMPLETE)