Hence, command 7 expands the variable into two arguments and deletes both files.

因此，命令7把此变量展开成两个参数并删除两个文件。

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Additionally, you can temporarily alter the value of an environment variable for a single command.

此外，您可以为单个命令临时地修改一个环境变量的值。

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The first command sets a helpful variable.

第一条命令设置一个帮助变量。

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