+/* in lcd.c */
+extern int do_lcd (const char *cmd, int argc, char *argv[]);
+
+/* in glob.c */
+extern int do_glob (const char *cmd, int argc, char *argv[]);
+
+/* in more.c */
+extern int do_more (const char *cmd, int argc, char *argv[]);
+
+/* in time.c */
+extern int do_time (const char *cmd, int argc, char *argv[]);
+