Updates 01_basic/yum.md

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Updates 01_basic/yum.md
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01_basic/yum.md
@@ -38,6 +38,8 @@ echo 6 &gt;&gt; /etc/yum/vars/releasever
 yum clean all
 // 如果报错，删除 subscription-manager
 rpm -e subscription-manager --nodeps
+// yum换车
+yum makecache
 ```