Take a group name on the command-line if available.

svn path=/head/; revision=262910

usr.sbin/bsdconfig/usermgmt/groupdel

@@ -65,6 +65,14 @@ f_dialog_title "$msg_delete $msg_group"
 f_dialog_backtitle "${ipgm:+bsdconfig }$pgm"
 f_mustberoot_init
 
+#
+# If given a group name, operate on it and exit
+#
+if [ "$1" ]; then
+	f_group_delete "$1"
+	exit $SUCCESS
+fi
+
 #
 # Loop until the user Exits, Cancels or presses ESC
 #