diff -U 3 -r nut-2.6.0.orig/drivers/upsdrvctl.c nut-2.6.0/drivers/upsdrvctl.c

--- nut-2.6.0.orig/drivers/upsdrvctl.c	2011-02-08 12:35:02 +0200

+++ nut-2.6.0/drivers/upsdrvctl.c	2011-02-08 12:40:38 +0200

@@ -283,16 +283,33 @@

 	}

 }

+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);

+}

+

 static void help(const char *progname)

 {

 	printf("Starts and stops UPS drivers via ups.conf.\n\n");

-	printf("usage: %s [OPTIONS] (start | stop | shutdown) [<ups>]\n\n", progname);

+	printf("usage: %s [OPTIONS] (list | start | stop | shutdown) [<ups>]\n\n", progname);

 	printf("  -h			display this help\n");

 	printf("  -r <path>		drivers will chroot to <path>\n");

 	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");

@@ -470,6 +487,10 @@

 		   "starts and you need to copy and paste that line and append the debug flags to that\n"

 		   "line (less the 'exec:' prefix).\n");

+

+	if (!strcmp(argv[0], "list"))

+		command = &list_driver;

+

 	if (!strcmp(argv[0], "start"))

 		command = &start_driver;