存储命令 Storage commands 首先，客户端会发送一行像这样的命令： First, the client sends a command line which looks like this: ..
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穿孔卡片是一种存储命令（一种类型的数据，你可以说）到一个媒介。
Punch cards were a way to store commands (a type of data, you could say) onto a medium.
histfile 变量用来指定存储命令执行历史的文件；默认设置是 $HOME/.history。
The histfile variable lets the user specify the name of the file where the command execution history should be stored; the default is $HOME/.history.
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.
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