--- nut-2.0.5/drivers/upsdrvctl.c.orig	2006-11-08 05:08:45 +0300
+++ nut-2.0.5/drivers/upsdrvctl.c	2007-03-25 05:39:26 +0400
@@ -276,6 +276,52 @@ static void start_driver(const ups_t *up
 	forkexec(dfn, argv, ups);
 }
 
+static void list_driver(const ups_t *ups)
+{
+	char	dfn[SMALLBUF];
+	int	ret;
+	struct	stat	fs;
+
+	snprintf(dfn, sizeof(dfn), "%s/%s", driverpath, ups->driver);
+	ret = stat(dfn, &fs);
+
+	if (ret < 0)
+		upslogx(LOG_ERR, "stat: %s: %m", dfn);
+	else
+		puts (dfn);
+}
+
+/* list user-selected driver */
+static void list_one_driver(const char *upsname)
+{
+	ups_t	*tmp = upstable;
+
+	if (!tmp)
+		fatalx("Error: no UPS definitions found in ups.conf!\n");
+
+	while (tmp) {
+		if (!strcmp(tmp->upsname, upsname)) {
+			list_driver(tmp);
+			return;
+		}
+
+		tmp = tmp->next;
+	}
+
+	fatalx("UPS %s not found in ups.conf", upsname);
+}
+
+/* walk ups table and list drivers */
+static void list_all_drivers(void)
+{
+	ups_t	*tmp = upstable;
+
+	while (tmp) {
+		list_driver(tmp);
+		tmp = tmp->next;
+	}
+}
+
 static void help(const char *progname)
 {
 	printf("Starts and stops UPS drivers via ups.conf.\n\n");
@@ -286,6 +332,8 @@ static void help(const char *progname)
 	printf("  -t			testing mode - prints actions without doing them\n");
 	printf("  -u <user>		drivers started will switch from root to <user>\n");
 	printf("  -D            	raise debugging level\n");
+	printf("  list			list all UPS drivers in ups.conf\n");
+	printf("  list <ups>		only list driver for UPS <ups>\n");
 	printf("  start			start all UPS drivers in ups.conf\n");
 	printf("  start	<ups>		only start driver for UPS <ups>\n");
 	printf("  stop			stop all UPS drivers in ups.conf\n");
@@ -457,6 +505,9 @@ int main(int argc, char **argv)
 	if (!strcmp(argv[0], "shutdown"))
 		command = &shutdown_driver;
 
+	if (!strcmp(argv[0], "list")) 
+		command = &list_driver;
+
 	if (!command)
 		fatalx("Error: unrecognized command [%s]", argv[0]);
 
@@ -466,6 +517,15 @@ int main(int argc, char **argv)
 
 	read_upsconf();
 
+	if (command == &list_driver) {
+		if (argc == 1)
+			list_all_drivers();
+		else
+			list_one_driver(argv[1]);
+
+		exit(EXIT_SUCCESS);
+	}
+
 	if (argc == 1)
 		send_all_drivers(command);
 	else