Get rid of useless -f flag (though left for historical reasons).

svn path=/head/; revision=18585

sbin/fsdb/fsdb.8

@@ -35,7 +35,8 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl d
-.Fl f Ar fsname
+.Op Fl f 
+.Ar fsname
 .Sh DESCRIPTION
 .Nm
 opens 
@@ -59,6 +60,10 @@ The
 option enables additional debugging output (which comes primarily from
 .Xr fsck 8 -derived
 code).
+.Pp
+The
+.Fl f
+option is left for historical reasons and has no meaning.
 .Sh COMMANDS
 Besides the built-in 
 .Xr libedit 3

sbin/fsdb/fsdb.c

@@ -95,8 +95,15 @@ main(argc, argv)
 			usage();
 		}
 	}
-	if (fsys == NULL)
-		usage();
+	argc -= optind;
+	argv += optind;
+	if (fsys == NULL) { 
+		if (argc != 1)
+			usage();
+		else
+			fsys = argv[0];
+	}
+
 	if (!setup(fsys))
 		errx(1, "cannot set up file system `%s'", fsys);
 	printf("Editing file system `%s'\nLast Mounted on %s\n", fsys,