+extern int parse_size (const char *str, off_t *size_rtn);
+
+/* in copy.c */
+extern int run_copy_in (const char *cmd, size_t argc, char *argv[]);
+extern int run_copy_out (const char *cmd, size_t argc, char *argv[]);
+
+/* in display.c */
+extern int run_display (const char *cmd, size_t argc, char *argv[]);