如何在centos下创建新用户名和密码

## Allow root to run any commands anywhere

root ALL=(ALL) ALL

prefma ALL=(ALL) ALL #这个是新用户

[root@localhost~]# chmod -v u-w /etc/sudoers

mode of ‘/etc/sudoers’ changed from 0640 (rw-r-----) to 0440 (r--r-----)

[prefma@localhost~]$ pwd

/home/prefma

[prefma@localhost~]$ ls -l /etc/sudoers

-r--r----- 1 root root 3995 Oct 16 22:42 /etc/sudoers