权限与安全CLI Manual
$chmod
更改所有者、用户组及其他用户的 Linux 文件读写执行权限。
命令语法POSIX Standard
chmod [OPTIONS] MODE[,MODE]... FILE...在交互式终端沙盒中实时运行
无需安装的客户端实时仿真环境。
bash — terminal
AST Sandbox (Free)
概述与工作原理
chmod 命令用于配置 Linux 系统的文件与目录权限模式，精准控制读取(r)、写入(w)与执行(x)权限。
常用参数与选项说明
| Flag / Option | Description |
|---|---|
| 755 | rwxr-xr-x: Owner has full control; group and others can read and execute. |
| 644 | rw-r--r--: Owner can read and write; group and others can read only. |
| 700 | rwx------: Owner has full control; no access for anyone else. |
| -R | Recursively change file permissions on all subdirectories and files. |
| +x | Make a script or binary file executable for all users. |
实际生产案例与代码范例
#1Make a bash script executable
chmod +x /home/user/projects/demo.sh && ls -l /home/user/projects/demo.shAdds execute permissions to demo.sh and verifies the updated mode bits.
#2Set standard web file permissions (644)
chmod 644 /var/log/syslogGrants read/write to owner and read-only to group and others.