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CentOS中，vim command not found

原本的export JAVA_HOME=/usr/java/jdk1.8.0_391 这行写成了jdk-1.8.0_391，导致java command not found

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不然读着像机翻...

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Reviewed-on: https://gitea.shuishan.net.cn/xslu_dase_ecnu_edu_cn/cloud-computing-course/pulls/5

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