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都是自己粗心，要先cd到解压后的httpd的文件夹里嘛。不过，我在关机的时候又遇到这个，为什么说user1 is not in the sudoers file呢?

[user1@mylinux ~]$ sudo poweroff

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

#1) Respect the privacy of others.
#2) Think before you type.
#3) With great power comes great responsibility.

Password:
user1 is not in the sudoers file. This incident will be reported.