We trust you have received the usual lecture from the local System Administrator. It usually boils
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linux下面无法运行sudo命令
(a)进入超级用户模式。
输入"su -",系统会让你输入超级用户密码，输入密码后就进入了超级用户模式。（当然，你也可以直接用root用）
(b)添加文件的写权限。
输入命令"chmod u+w /etc/sudoers"。
(c)编辑/etc/sudoers文件。
输入命令"vim /etc/sudoers",进入编辑模式，找到这一 行："root ALL=(ALL) ALL"在起下面添加"xxx ALL=(ALL) ALL"(这里的xxx是你的用户名)，然后保存退出。
(d)撤销文件的写权限。
输入命令"chmod u-w /etc/sudoers"。
(a)进入超级用户模式。
输入"su -",系统会让你输入超级用户密码，输入密码后就进入了超级用户模式。（当然，你也可以直接用root用）
(b)添加文件的写权限。
输入命令"chmod u+w /etc/sudoers"。
(c)编辑/etc/sudoers文件。
输入命令"vim /etc/sudoers",进入编辑模式，找到这一 行："root ALL=(ALL) ALL"在起下面添加"xxx ALL=(ALL) ALL"(这里的xxx是你的用户名)，然后保存退出。
(d)撤销文件的写权限。
输入命令"chmod u-w /etc/sudoers"。
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