Linux用户没有sudo权限

1 问题：Linux用户没有sudo权限

[book@localhost ~]$ sudo cp -rf  jdk1.8.0_201/ /usr/local/jdk18
[sudo] password for book: 
book is not in the sudoers file.  This incident will be reported.

2、切换为root

[book@localhost ~]$ su
Password: 
[root@localhost book]# visudo

3、修改

## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL
book    ALL=(ALL)       ALL

添加一行：book ALL=(ALL) ALL
其中：book为我的用户名；
自己定义的用户名；

4、执行上述命令

[root@localhost book]# exit
exit
[book@localhost ~]$ sudo cp -rf  jdk1.8.0_201/ /usr/local/jdk18
[sudo] password for book: 
[book@localhost ~]$ 

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