1.输入该命令按回车键:dnf update -y
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2.输入该命令按回车键:dnf install -y centos-release-stream

3.输入该命令按回车键:rpm -q centos-release-stream
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4.输入该命令按回车键:dnf install -y centos-release-stream

5.输入该命令按回车键:dnf swap -y centos-{linux,stream}-repos

6.输入该命令按回车键:dnf update -y

7.输入该命令按回车键查看版本:cat /etc/redhat-release












