CHACL(1)                                              Access Control Lists                                              CHACL(1)



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

SYNOPSIS
       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...

DESCRIPTION
       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  Refer to the SEE ALSO section below for a description of tools which conform more  closely  to  the  (withdrawn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 pathname argu-
       ments.

       Each ACL is a string which is interpreted using the acl_from_text(3) routine.  These strings are made up of  comma  sepa-
       rated 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", "---".

OPTIONS
       -b     Indicates that there are two ACLs to change, the first is the file access ACL and the second the directory 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 during the
              Linux port of XFS, and is not compatible with IRIX.

EXAMPLES
       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

CAUTIONS
       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.

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



September 2001                                         ACL File Utilities                                               CHACL(1)