This directory of Linux commands is from Linux in a Nutshell, 5th Edition.
Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.
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chattr
chattr [options] mode files
Modify file attributes. Specific to Linux Second and Third Extended Filesystem (ext2 and ext3). Behaves similarly to symbolic chmod, using +, -, and =. mode is in the form opcode attribute. See also lsattr.
Options
Modify directories and their contents recursively.
Print modes of attributes after changing them.
Set the file's version.
Opcodes
Add attribute.
Remove attribute.
Assign attributes (removing unspecified attributes).
Attributes
Don't update access time on modify.
Append only for writing. Can be set or cleared only by a privileged user.
Compressed.
No dump.
Immutable. Can be set or cleared only by a privileged user.
Journalled file. This is useful only in cases where you are using an ext3 filesystem mounted with the data="ordered" or data="writeback" attributes. The data="journalled" option for the filesystem causes this operation to be performed for all files in the system and makes this option irrelevant.
Synchronous updates.
Secure deletion. The contents are zeroed on deletion, and the file cannot be undeleted or recovered in any way.
Undeletable. This causes a file to be saved even after it has been deleted, so that a user can undelete it later.
Example
chattr +a myfile
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