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chacl changes the ACL(s) for a file or directory. The ACL(s) specified are applied to each file in the pathname arguments.
Each ACL is a string which is interpreted using the acl_from_text(3) routine. These strings are made up of comma separated clauses each of which is of the form, tag:name:perm. Where tag can be:
name is a string which is the user or group name for the ACL entry. A null name in a user or group ACL entry indicates the file's owner or file's group. perm is the string "rwx" where each of the entries may be replaced by a "-" indicating no access of that type, e.g. "r-x", "--x", "---".
chacl u::rwx,g::r-x,o::r-- file
The file ACL is set so that the file's owner has "rwx", the file's group has read and execute, and others have read only access to the file.
An ACL that is not a minimum ACL, that is, one that specifies a user or group other than the file's owner or owner's group, must contain a mask entry:
chacl u::rwx,g::r-x,o::r--,u:bob:r--,m::r-x file1 file2
To set the default and access ACLs on newdir to be the same as on olddir, you could type:
chacl -b `chacl -l olddir | \ sed -e 's/.*\[//' -e 's#/# #' -e 's/]$//'` newdir
Changing the permission bits of a file will change the file access ACL settings (see chmod(1)). However, file creation mode masks (see umask(1)) will not affect the access ACL settings of files created using directory default ACLs.
ACLs are filesystem extended attributes and hence are not typically archived or restored using the conventional archiving utilities. See attr(5) for more information about extended attributes and see xfsdump(8) for a method of backing them up under XFS.