如果该命令不确定类的位置，将打开一个窗口并显示一列可以进行选择的选项。
If the command is unsure about the class's location, a window opens with a list of options for you to choose from.
为了生成运行更加快捷并易于维护的代码，使用散列表存储命令行选项并使用散列验证用户指定的输入，这种方法非常有帮助。
To produce code that runs faster and is easy to maintain, it makes far more sense to use a hash table that stores the command-line options, then USES the hash to validate the user-specified input.
在清单18中，列出了所有运行getty命令的进程；我们使用- o选项来自指定将要显示的列。
In Listing 18, all processes running the getty command are listed; we use the -o option to specify the columns that will be displayed.
在清单18中，列出了所有运行getty命令的进程；我们使用- o选项来自指定将要显示的列。
In Listing 18, all processes running the getty command are listed; we use the -o option to specify the columns that will be displayed.
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