The Linux chattr command

chattr command

Description: Change the properties of a file

chattr [-RVF] [-v version] [mode] files ...

Syntax: chattr [-rv][-v< version number >][+/-/=< properties >][file or directory ...]

Change files attributes on a Linux second extended file system, changing the properties of the documents stored on the ext2 filesystem

There are 8 types of patterns.

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.

The symbolic pattern is: +-= (plus minus), plus the corresponding attributes

+-=[asacddiijsttu]

Append only (a),

Compressed (c),

No dump (d),

Immutable (i), immutable

Data journalling (j),

Secure deletion (s),

No tail-merging (t),

undeletable (U),

No atime updates (A),

Synchronous directory Updates (D),

Synchronous Updates (S),

and top of directory hierarchy (T).

Parameter description

-R: Recursive processing

-V: Show detailed procedures

+< 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.

Instance:

Add the +i attribute, prevent the file to be modified, carry on this operation to some confidential file, will have the very good effect, if can add this attribute to the/etc/passwd file, other people can only view

[email protected] test]# ll total 20-rw-r--r--1 root 08-24 01:17 1.txt-rw-r--r--1 root root 0 08-24 01:28 2.txt-rw -r--r--1 root root 08-24 01:20 3.txt[[email protected] test]# chattr +i 1.txt [[email protected] test]# vim 1.txt

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The Linux chattr command