这些语言是按命令及执行操作的函数进行编码的。
These languages are coded by command, and functions perform the actions.
要使用跟踪，可以指定跟踪到信号时执行的命令或函数、要跟踪的信号编号，如此处的清单13中所示。
To use trap, you specify the command or function to be executed when the signal is trapped, and the signal number or Numbers that you want to trap, as shown here in Listing 13.
现在我们看看应用程序如何使用这个函数执行inquiry命令，如清单4所示？
Now let's see how the application program USES this function to execute the inquiry command (Listing 4)?
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