For example, place all those fields which might be used in decision making to route the messages at the beginningof the message.
例如,将所有这些可能使用的字段都放置在决策中,以在消息的开始位置路由消息。
2
Listing 4 shows the beginningof the sample wrapper script, which defines a usage message that displays if you execute the script with no arguments or the wrong number of arguments.