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09. Linux文件权限与用户管理

  • 2026-02-25 23:05:44
09. Linux文件权限与用户管理

09. Linux文件权限与用户管理

Linux 是一个多用户操作系统,它对"谁"能对"什么文件"做"什么事"有着极其严格的控制。这就是权限 (Permissions)

1. 理解 ls -l 的输出

在终端输入 ls -l,你会看到类似这样的输出:drwxr-xr-x 2 user user 4096 Jan 1 12:00 Documents

我们主要关注第一列 drwxr-xr-x,它决定了权限。

  • • 第 1 位: 文件类型。d 代表目录 (Directory),- 代表普通文件。
  • • 第 2-4 位 (rwx)所有者 (Owner) 的权限。
  • • 第 5-7 位 (r-x)所属组 (Group) 的权限。
  • • 第 8-10 位 (r-x)其他人 (Others) 的权限。

rwx 的含义:

  • • r (Read): 读。对文件是查看内容,对目录是列出文件名。
  • • w (Write): 写。对文件是修改内容,对目录是新建/删除文件。
  • • x (Execute): 执行。对文件是运行脚本/程序,对目录是进入该目录。

2. 修改权限:chmod

chmod (Change Mode) 用于修改文件权限。

方式一:数字法(最常见)

  • • r = 4
  • • w = 2
  • • x = 1
  • • 无 = 0

例如 rwx = 4+2+1 = 7,r-x = 4+0+1 = 5。chmod 755 file 意味着:所有者(7=rwx),组(5=rx),其他人(5=rx)。

方式二:符号法

  • • u (User), g (Group), o (Others), a (All)
    • • (添加), - (移除), = (设置)
chmod +x script.sh      # 给所有人添加执行权限 (最常用)chmod u+w file.txt      # 给所有者添加写权限chmod o-r secret.txt    # 移除其他人的读权限

3. 超级用户:Root 与 Sudo

在 Linux 中,有一个神一般的存在叫 Root。它可以做任何事,包括删掉整个系统。为了安全,Ubuntu 默认锁定了 Root 账户,普通用户只能通过 sudo (SuperUser DO) 来临时获得管理员权限。

  • • 什么时候用 sudo?当你要安装软件、修改系统配置、编辑 /etc 下的文件时。
  • • 怎么用?在命令前加上 sudo
    sudo apt update
    系统会要求你输入你的密码(输入时屏幕不会显示星号,盲打完回车即可)。

一个实用习惯:能不用 sudo 就不用。很多“权限不够”的问题,其实是文件所有者/所属组不对,优先用 chown 把所有权修正,再谈 chmod

4. 用户与组管理

chown (Change Owner)

改变文件的所有者。

sudo chown user:group file.txtsudo chown -R user:user /var/www/html  # 递归修改文件夹所有者

useradd / adduser

创建新用户。推荐用 adduser,它有交互式向导,更友好。

sudo adduser newuser

usermod

修改用户属性。最常用的是把用户加入 sudo 组,赋予管理员权限。

sudo usermod -aG sudo newuser

理解了权限,你就理解了为什么 Linux 比 Windows 安全。在 Linux 里,病毒想运行?先问问 chmod 答不答应。

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  1. CONNECT:[ UseTime:0.000530s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001051s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000681s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000637s ]
  8. SELECT * FROM `article` WHERE `id` = 476433 LIMIT 1 [ RunTime:0.000511s ]
  9. UPDATE `article` SET `lasttime` = 1772253651 WHERE `id` = 476433 [ RunTime:0.013763s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000252s ]
  11. SELECT * FROM `article` WHERE `id` < 476433 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000536s ]
  12. SELECT * FROM `article` WHERE `id` > 476433 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000383s ]
  13. SELECT * FROM `article` WHERE `id` < 476433 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009757s ]
  14. SELECT * FROM `article` WHERE `id` < 476433 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005040s ]
  15. SELECT * FROM `article` WHERE `id` < 476433 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016358s ]
0.117836s