-property :exec_start_pre, String
-property :exec_start, String
-property :exec_start_post, String
-property :exec_stop, String
+property :exec_start_pre, [String, Array]
+property :exec_start, [String, Array]
+property :exec_start_post, [String, Array]
+property :exec_stop, [String, Array]
+property :exec_stop_post, [String, Array]