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YouMeek
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2017-07-18
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Bash.md

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- `export`,查看所有系统变量
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- `echo $JAVA_HOME`,查看指定系统变量的值,这里查看的是自己配置的 JAVA_HOME。
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- `unset $JAVA_HOME`,删除指定的环境变量
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- `ln -s /opt/data /opt/logs/data`,表示给 /opt/logs 目录下创建一个名为 data 的软链接,该软链接指向到 /opt/data
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## 用户、权限-相关命令

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