Installation guide

Chapter 16. Access Control Lists
104
Option Description
files are newer than the files of the same name in the
archive. This option only works if the archive is a file or an
unblocked tape that may backspace.
-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.
16.6. Compatibility with Older Systems
If an ACL has been set on any file on a given file system, that file system has the ext_attr attribute.
This attribute can be seen using the following command:
tune2fs -l filesystem-device
A file system that has acquired the ext_attr attribute can be mounted with older kernels, but those
kernels do not enforce any ACLs which have been set.
Versions of the e2fsck utility included in version 1.22 and higher of the e2fsprogs package
(including the versions in Red Hat Enterprise Linux 2.1 and 4) can check a file system with the
ext_attr attribute. Older versions refuse to check it.
16.7. References
Refer to the following man pages for more information.
• man acl — Description of ACLs
• man getfacl — Discusses how to get file access control lists
• man setfacl — Explains how to set file access control lists
• man star — Explains more about the star utility and its many options