1、系統

[root@centos7pc1 test2]# lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID: CentOS
Description:    CentOS Linux release 
 
7.9.2009 (Core)
Release:        7.9.2009
Codename:       Core

2、使用 grep bash /etc/passwd 檢視當前所有建立的使用者

[root@centos7pc1 test2]# grep bash /etc/passwd    ## 一共三個使用者
root:x:0:0:root:/root:/bin/bash
liujiaxin01:x:1000:1000:liujiaxin01:/home/liujiaxin01:/bin/bash
liujiaxin02:x:1001:1001::/home/liujiaxin02:/bin/bash

3、建立一個使用者進行驗證

[root@centos7pc1 test2]# useradd liujiaxin03
 

[root@centos7pc1 test2]# echo "abc123456" | passwd --stdin liujiaxin03
Changing password for user liujiaxin03.
passwd: all authentication tokens updated successfully.
[root@centos7pc1 test2]# grep bash /etc/passwd  ## 一共四個使用者
root:x:0:0:root:/root:/bin/bash
liujiaxin01:x:1000:1000:liujiaxin01:/home/liujiaxin01:/bin/bash
liujiaxin02:x:
 
1001:1001::/home/liujiaxin02:/bin/bash
liujiaxin03:x:1002:1002::/home/liujiaxin03:/bin/bash