new helper function for kernel versions

bash_completion

@@ -357,6 +357,13 @@ _configured_interfaces()
 	fi
 }
 
+# This function complete on available kernels
+#
+_kernel_versions()
+{
+	COMPREPLY=( $( command ls /lib/modules | grep "^$cur" ) )
+}
+
 # This function completes on all available network interfaces
 # -a: restrict to active interfaces only
 # -w: restrict to wireless interfaces only