sudo是Linux系统管理指令，是允许系统管理员让普通用户执行一些或者全部root命令的一个工具。Linux系统下，为了安全，一般来说我们操作都是在普通用户下操作，但是有时候普通用户需要使用root权限，比如在安装软件的时候。这个时候如果我们切回root用户下效率就会比较低，所以用sudo命令就会很方便。
yum install sudo [root@VM_0_6_centos ~]# yum install sudo Loaded plugins: fastestmirror, langpacks Repository epel is listed more than once in the configuration Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package sudo.x86_64 0:1.8.19p2-13.el7 will be updated ---> Package sudo.x86_64 0:1.8.23-4.el7_7.2 will be an update --> Finished Dependency Resolution
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/etc/sudoers文件默认是只读权限，必须修改为可写，修改后可以复原回去
chmod u+w /etc/sudoers
给普通用户XX添加sudo权限
xx ALL=(ALL) ALL
[xx@VM_0_6_centos ~]$ sudo pip3 install requests 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. [sudo] password for xx:
原文：https://www.cnblogs.com/xiao-apple36/p/12688584.html