Linux command
chattr 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
Example
sudo chattr +i path/to/file
Example
sudo chattr -i path/to/file
Recursive
sudo chattr -R +i path/to/dir
Case-folding
chattr +F path/to/dir
Append-only
sudo chattr +a path/to/file
说明
chattr changes file attributes on Linux filesystems. These extended attributes provide security and administrative controls beyond standard permissions, such as making files immutable or append-only. The immutable attribute (+i) is particularly useful for protecting critical system files, as even root cannot modify, delete, or rename an immutable file until the attribute is removed. The append-only attribute (+a) is commonly used for log files to prevent tampering while still allowing new entries to be written.
参数
- +attribute
- Add attribute to file
- -attribute
- Remove attribute from file
- =attribute
- Set only the specified attributes
- -R
- Change attributes recursively
- i
- Immutable - cannot be modified, deleted, or renamed
- a
- Append-only - can only be appended to
- s
- Secure deletion - blocks overwritten with zeros
- S
- Synchronous updates
- A
- No atime updates
- c
- Compressed
- e
- Extent format (default on ext4)
- F
- Case-fold directory (case-insensitive)
FAQ
What is the chattr command used for?
chattr changes file attributes on Linux filesystems. These extended attributes provide security and administrative controls beyond standard permissions, such as making files immutable or append-only. The immutable attribute (+i) is particularly useful for protecting critical system files, as even root cannot modify, delete, or rename an immutable file until the attribute is removed. The append-only attribute (+a) is commonly used for log files to prevent tampering while still allowing new entries to be written.
How do I run a basic chattr example?
Run `sudo chattr +i path/to/file` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does +attribute do in chattr?
Add attribute to file