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linux(第七期)--Linux用户与用户组-- Ubuntu20.04

  • 2026-06-30 10:50:20
linux(第七期)--Linux用户与用户组-- Ubuntu20.04

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在这里主要分享自己学习的linux嵌入式领域知识;有分享错误或者不足的地方欢迎大佬指导,也欢迎各位大佬互相三连

目录

Linux用户组

创建用户和用户组

总结


Linux是一个多用户操作系统,不同的用户拥有不同的权限。可以查看和操作不同的文件。 Ubuntu有三种用户:

1、初次创建的用户。

2、root用户

3、普通用户。

初次创建的用户权限比普通用户多,但是没有root用户多,初次创建的用户可以创建普通用户。

Linux用户记录在/etc/passwd这个文件内。

Linux用户密码记录在/etc/shadow这个文件内。

每个用户都有一个ID,叫做UID。

Linux用户组

为了方便管理,将用户进行分组。这样就可以设置非本组人员不能访问某些文件。每个用户可以属于多个不同的组。

用户:家里有你、弟弟、妹妹个人,每个人都有自己的房间,你们三个人都是用户,你们都不能随便的乱翻别人的房间。

用户组:你们三个都是一个家庭的,也就是属于同一个用户组,你们三个可以共用厨房,书房等空间。

因此:

用户和用户组的存在就是为了控制文件的访问权限的。

每个用户组都有一个ID,叫做GID。

用户组信息存储在/etc/group文件中。

创建用户和用户组

1、图形化界面创建

要使用图形化界面创建用户和用户组的话就需要安装gnome-system-tools这个工具:

sudo apt-get install gnome-system-tools

2、命令创建用户和用户组

添加用户:adduser命令,adduser 用户名

用户查询:finger命令,finger 用户名

修改用户密码:passwd命令,passwd 用户名

删除用户:deluser命令,deluser 用户名

添加用户组:addgroup命令,addgroup 用户组名

显示组内用户名:groups命令,groups 用户组名

删除用户组:delgroup命令,delgroup用户组名


总结

本期博客介绍了Linux用户与用户组。


总结

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  1. CONNECT:[ UseTime:0.000515s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000790s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000340s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000432s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000490s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000598s ]
  8. SELECT * FROM `article` WHERE `id` = 492642 LIMIT 1 [ RunTime:0.000575s ]
  9. UPDATE `article` SET `lasttime` = 1783091661 WHERE `id` = 492642 [ RunTime:0.017507s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000332s ]
  11. SELECT * FROM `article` WHERE `id` < 492642 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000479s ]
  12. SELECT * FROM `article` WHERE `id` > 492642 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003592s ]
  13. SELECT * FROM `article` WHERE `id` < 492642 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001063s ]
  14. SELECT * FROM `article` WHERE `id` < 492642 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000768s ]
  15. SELECT * FROM `article` WHERE `id` < 492642 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005082s ]
0.100989s