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Linux服务器默认禁止root账户登入，需要先用子账号登入，如何实现子账户登入成功后立即通过su切换到root账户？ 目前测试在初始化，初始执行中加入命令，登入后可以正常输入su，但是密码不会自动输入 初始执行命令如下： su su的密码
