Solaris ZFS Administration Guide

Applying Special Attributes to ZFS Files

The following examples show how to apply and display special attributes, such as immutability or read-only access, to ZFS files.

For more information about displaying and applying special attributes, see ls(1) and chmod(1).

Example 8–14 Apply Immutability to a ZFS File

Use the following syntax to make a file immutable:

# chmod S+ci file.1
# echo this >>file.1
file.2: cannot create
# rm file.1
rm: file.1: override protection 644 (yes/no)? yes
rm: file.1 not removed: Not owner

You can display special attributes on ZFS files by using the following syntax:

# ls -l/c file.1
-rw-r--r--   1 root     root           206674 Jul 31 10:52 file.1
                {A-----im--}

Use the following syntax to remove file immutability:

# chmod S-ci file.1
# ls -l/c file.1
-rw-r--r--+  1 root     root      206674 Jul 29 10:27 file.1
                {A------m--}
# rm file.1

Example 8–15 Apply Read-Only Access to a ZFS File

The following example shows how to apply read-only access to a ZFS file.

# chmod S+cR file.2
# echo this >>file.2
file.2: cannot create

Example 8–16 Displaying and Removing ZFS File Attributes

You can display all special attributes with the following syntax:

# ls -l/v file.3
-r--r--r--   1 root     root      206674 Jul 31 11:30 file.3
                {archive,nohidden,noreadonly,nosystem,noappendonly,nonodump,immutable,
av_modified,noav_quarantined,nonounlink}
# chmod S+cR file.3
# ls -l/v file.3
-r--r--r--   1 root     root      206674 Jul 31 11:30 file.3
                {archive,nohidden,readonly,nosystem,noappendonly,nonodump,immutable,
av_modified,noav_quarantined,nonounlink}

Some of these attributes only apply in a CIFS environment.

You can clear all attributes on a file. For example:

# chmod S-a file.3
# ls -l/v file.3
-r--r--r--   1 root     root      206674 Jul 31 11:30 file.3
                {noarchive,nohidden,noreadonly,nosystem,noappendonly,nonodump,noimmutable,
noav_modified,noav_quarantined,nonounlink}