Linux command
chmod 命令
安全
权限或系统影响较大，执行前请核对目标。
常用示例
Make
chmod +x [script.sh]
Set
chmod 755 [file]
Remove
chmod -w [file]
Recursive
chmod -R 755 [directory/]
Set
chmod u=rwx,g=rx,o=r [file]
说明
chmod (change mode) modifies file access permissions. It controls read, write, and execute permissions for three classes of users: the file owner (user), the file's group, and all other users. Permissions can be specified in two ways: numeric (octal) mode using digits 0-7, or symbolic mode using letters (u/g/o/a, +/-/=, r/w/x). Numeric mode sets all permissions at once, while symbolic mode allows adding or removing individual permissions. The command is fundamental to Unix file security and access control.
参数
- -R, --recursive
- Change files and directories recursively
- -v, --verbose
- Verbose output
- -c, --changes
- Report only changes
- --reference=_file_
- Use permissions from reference file
FAQ
What is the chmod command used for?
chmod (change mode) modifies file access permissions. It controls read, write, and execute permissions for three classes of users: the file owner (user), the file's group, and all other users. Permissions can be specified in two ways: numeric (octal) mode using digits 0-7, or symbolic mode using letters (u/g/o/a, +/-/=, r/w/x). Numeric mode sets all permissions at once, while symbolic mode allows adding or removing individual permissions. The command is fundamental to Unix file security and access control.
How do I run a basic chmod example?
Run `chmod +x [script.sh]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -R, --recursive do in chmod?
Change files and directories recursively