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       the SEE ALSO section below for a description of tools which conform more closely to the (withdrawn  draft)  POSIX  1003.1e  standard  which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 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", "---".

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)