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                ``` 全局環境變量對于shell會話和所有生成的子shell都是可見的。 局部變量則只對創建它們的 shell可見。 這讓全局環境變量對那些所創建的子shell需要獲取父shell信息的程序來說非常有用。 ``` 查看全局變量 ``` env 或 printenv ``` ``` root@ecs-a672-0002:/# printenv HOME /root root@ecs-a672-0002:/# env HOME env: ‘HOME’: No such file or directory root@ecs-a672-0002:/# echo $HOME /root ``` 設置 ``` test="test" export test ``` 刪除 ``` unset test ```
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