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20.5. Archiving File Systems With ACLs
By default, the
dump
command now preserves ACLs during a backup operation. When archiving a file or file system with tar
, use the --acls
option to preserve ACLs. Similarly, when using cp
to copy files with ACLs, include the --preserve=mode
option to ensure that ACLs are copied across too. In addition, the -a
option (equivalent to -dR --preserve=all
) of cp
also preserves ACLs during a backup along with other information such as timestamps, SELinux contexts, and the like. For more information about dump
, tar
, or cp
, refer to their respective man
pages.
The
star
utility is similar to the tar
utility in that it can be used to generate archives of files; however, some of its options are different. Refer to Table 20.1, “Command Line Options for star
” for a listing of more commonly used options. For all available options, refer to man star
. The star
package is required to use this utility.
Option | Description |
---|---|
-c | Creates an archive file. |
-n | Do not extract the files; use in conjunction with -x to show what extracting the files does. |
-r | Replaces files in the archive. The files are written to the end of the archive file, replacing any files with the same path and file name. |
-t | Displays the contents of the archive file. |
-u | Updates the archive file. The files are written to the end of the archive provided the following are true:
|
-x | Extracts the files from the archive. If used with -U and a file in the archive is older than the corresponding file on the file system, the file is not extracted. |
-help | Displays the most important options. |
-xhelp | Displays the least important options. |
-/ | Do not strip leading slashes from file names when extracting the files from an archive. By default, they are stripped when files are extracted. |
-acl | When creating or extracting, archives or restores any ACLs associated with the files and directories. |