Manual: chacl

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 (with‐
       drawn 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	 ar‐
       guments.

       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  indi‐
       cates  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 de‐
	      fault 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 cre‐
       ation 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)