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Linux系统基础命令介绍

  • 2026-03-26 19:27:53
Linux系统基础命令介绍

1、创建用户test6 不添加-u 参数,直接创建用户 test6
useradd test6

查询是否创建的成功,成功则显示用户id,gid 和other id
id test6
uid=1003(test6) gid=1004(test6) 组=1004(test6)

2、
useradd -u 1007 test7 添加-u 参数,指定id号 创建test7账号



3、指定用户的gid
首先要创建gid组
groupadd test8 第一种是不带gid的创建组test8

检查创建的组信息:
cat /etc/group 在文件的最后几行是新创建的test8 或者其他的组id

test8:x:1008:


4、使用useradd 加gid创建用户
useradd -u 1008 -g 1008 test8


查看新创建的用户信息:
id test8
uid=1008(test8) gid=1008(test8) 组=1008(test8)

或者使用
cat /etc/passwd 在文档最后几行显示的就是我们新加的用户信息。

test7:x:1007:1007::/home/test7:/bin/bash
test8:x:1008:1008::/home/test8:/bin/bash
出现上面的 信息表示成功。

5、 创建用户使用-s参数,不让用户登陆

useradd -s /sbin/nologin test9

查看新创建的用户的信息:

id test9
uid=1009(test9) gid=1009(test9) 组=1009(test9)

或者 使用
cat /etc/passwd
文件最后几行,出现/sbin/nologin 表示上面-s 参数执行成功。

test9:x:1009:1009::/home/test9:/sbin/nologin

6、创建用户指定家目录的位置-d参数:
首先要有这个家目录才可以,加-d参数创建 指定家目录的用户。

cd /home/
新建test10 目录

# ls
test10 test5 test6 test7 test8 test9 user2 victor

看到test10 这个目录,表示mkdir创建的目录成功。

useradd -d /home/test10 test10
useradd:警告:此主目录已经存在。
不从 skel 目录里向其中复制任何文件。


查看这个用户的创建的信息:
cat /etc/passwd

test10:x:1010:1010::/home/test10:/bin/bash

表示成功,但注意可能没有skel 相关的文件:

[root@localhost home]# cd test10/
[root@localhost test10]# ls
[root@localhost test10]# ls -al
总用量 0
drwxr-xr-x 2 root root 6 3月 14 20:41 .
drwxr-xr-x. 10 root root 112 3月 14 20:41 ..
[root@localhost test10]#

7、创建用户-c参数添加描述;
[root@learn home]# useradd -c test11 test11
查看创建的结果:
[root@learn home]# cat /etc/passwd
user8:x:1011:

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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.001116s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001605s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000814s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000658s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001267s ]
  6. SELECT * FROM `set` [ RunTime:0.000607s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001457s ]
  8. SELECT * FROM `article` WHERE `id` = 480653 LIMIT 1 [ RunTime:0.001600s ]
  9. UPDATE `article` SET `lasttime` = 1774576252 WHERE `id` = 480653 [ RunTime:0.011986s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000645s ]
  11. SELECT * FROM `article` WHERE `id` < 480653 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001200s ]
  12. SELECT * FROM `article` WHERE `id` > 480653 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001190s ]
  13. SELECT * FROM `article` WHERE `id` < 480653 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001964s ]
  14. SELECT * FROM `article` WHERE `id` < 480653 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002347s ]
  15. SELECT * FROM `article` WHERE `id` < 480653 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006084s ]
0.209154s