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CHACL(1)                     Access Control Lists                     CHACL(1)

       chacl - change the access control list of a file or directory

       chacl acl pathname...
       chacl -b acl dacl pathname...
       chacl -d dacl pathname...
       chacl -R pathname...
       chacl -D pathname...
       chacl -B pathname...
       chacl -l pathname...
       chacl -r pathname...

       chacl  is  an  IRIX-compatibility command, and is maintained for those users who are familiar with its use from
       either XFS or IRIX.  Refer to the SEE ALSO section below for a description of tools which conform more  closely
       to the (withdrawn draft) POSIX 1003.1e standard which describes Access Control Lists (ACLs).

       chacl  changes  the ACL(s) for a file or directory.  The ACL(s) specified are applied to each file in the path-
       name 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:

       "user" (or "u")
              indicating that the entry is a user ACL entry.

       "group" (or "g")
              indicating that the entry is a group ACL entry.

       "other" (or "o")
              indicating that the entry is an other ACL entry.

       "mask" (or "m")
              indicating that the entry is a mask ACL entry.

       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", "---".

       -b     Indicates  that there are two ACLs to change, the first is the file access ACL and the second the direc-
              tory default ACL.

       -d     Used to set only the default ACL of a directory.

       -R     Removes the file access ACL only.

       -D     Removes directory default ACL only.

       -B     Remove all ACLs.

       -l     Lists the access ACL and possibly the default ACL associated with the specified  files  or  directories.
              This option was added during the Linux port of XFS, and is not IRIX compatible.

       -r     Set  the access ACL recursively for each subtree rooted at pathname(s).  This option was also added dur-
              ing the Linux port of XFS, and is not compatible with IRIX.

       A minimum ACL:

         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

       chacl can replace the existing ACL.  To add or delete entries, you must first do chacl -l to get  the  existing
       ACL, and use the output to form the arguments to chacl.

       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.

       getfacl(1), setfacl(1), chmod(1), umask(1), acl_from_text(3), acl(5), xfsdump(8)

September 2001                ACL File Utilities                      CHACL(1)