File and directory operations command (19) - 15.chattr

Linux chattr command is used to change file attributes.

The instructions may change stored on the ext2 file system file or directory attributes that total the following 8 modes:

1. a: Let the file or directory is for additional uses.
2. b: do not update the last access time of the file or directory.
3. c: to store the file or directory compression.
4. d: the file or directory exclude tilting operation.
5. i: not any change on a file or directory.
6. s: Confidentiality delete files or directories.
7. S: Instant update a file or directory.
8. u: prevent accidental erasure.

grammar

the chattr [- the RV ] [- V <version number>] [+ / - / = <attribute>] [file or directory ...]

parameter

　　-R recursive processing, all files and subdirectories in the specified directory dealt with together.

　　-v <version number> settings file or directory versions.

　　-V display process execution instruction.

　　+ <Properties> Properties to open the file or directory.

　　- <property> to close the file or directory attributes.

　　= <Attributes> Specify the file or directory attributes.

Examples

To prevent a critical system file is modified with the chattr command:

chattr +i /etc/resolv.conf

lsattr /etc/resolv.conf

It will display the following attributes

----i-------- /etc/resolv.conf

So that a file can only be entered, and additional data, but can not be deleted for a variety of log files:

chattr +a /var/log/messages