Why*_*Why 5 linux redhat user-management centos sudo
[user@localhost ~]$ su -
Password:
Last login: ...
[root@localhost ~]# usermod -aG wheel user
[root@localhost ~]# exit
logout
[user@localhost ~]$ sudo echo 123
[sudo] password for user:
user is not in the sudoers file. This incident will be reported.
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我做错了什么?