Redhat7 安装 yum 博主亲自安装记录！！！！

因为以前安装Redhat7 想安装gcc   使用yum   install gcc  报错：node This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register. vim 大概意思是是让你先注册一下。centos 这是redhat 自带

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