Consult your shell's man page for a complete list of available environment variables.

查阅shell手册页，获取可用环境变量的完整列表。

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Enables you to remove a name from the list of environment variables.

允许你从环境变量表中删去一个名字。

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Enables you to remove a name from the list of environment variables.

允许你从环境变量表中删去一个名字。

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