Change file attributes in Linux ext2 and ext3 file systems.
chattr [ -RV ] [ -v
version
] [
mode
]
files...
-V verbosely displays permission changes.
-v
version sets the version number of the file to
version .
The attribute is defined by the
mode argument and mode is of the form
+-=[ASacdisu] , where the
+ causes the specified attributes to be added to the existing attributes of the files,
- causes them to be removed from the existing attributes, and
= causes the file attributes to be set to only the specified attributes. The letters
ASacdisu specify the attributes for the files:
A means do not update
atime (
atime is the time when file was accessed),
S means synchronous updates, a means append only,
c means compressed,
i means immutable (file cannot be changed),
d means no dump,
s means secure deletion (file contents are completely wiped out when it is deleted), and
u means undeletable (file cannot be removed).