Linux Basic Command Learning (vi) Special properties of files

The Linux chattr command is used to change file properties.

This directive alters the file or directory attributes stored on the ext2 file system, which have the following 8 modes:

A: Make the file or directory available for additional use only.
B: Do not update the last access time of the file or directory.
C: Compress the file or directory and store it.
D: Exclude files or directories from dumping operations.
I: Do not alter the file or directory arbitrarily.
S: Privacy delete files or directories.
S: Update files or directories instantly.
U: Remove outside of prevention.

Grammar:

[-RV][-v< version number >][+/-/=< Properties >][file or directory ...]     

Parameters:

-R recursively handles all files and subdirectories under the specified directory.

-v< version number > set file or directory version.

-V Displays the instruction execution process.

+< Properties > Open the Item property of the file or directory.

-< Properties > Close the Item property of the file or directory.

The =< property > Specifies the Item property of the file or directory.

Example:

Use the chattr command to prevent a key file in the system from being modified:

Chattr +I/ECT/MIAN.CONFG

Lsattr/ect/main.confg

Allow a file to append data only to it, but not delete it, for various log files:

Chattr +a/etc/mysql.log

Linux Basic Command Learning (vi) Special properties of files