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setfacl(1)

NAME

     setfacl -- set ACL information

SYNOPSIS

     setfacl [-bdhkn] [-m entries] [-M file1] [-x entries] [-X file1]
	     [file ...]

DESCRIPTION

     The setfacl utility sets discretionary access control information on the
     specified file(s).

     The following options are available:

     -b      Remove all ACL entries except for the three required entries.  If
	     the ACL contains a ``mask'' entry, the permissions of the
	     ``group'' entry in the resulting ACL will be set to the permis-
	     sion associated with both the ``group'' and ``mask'' entries of
	     the current ACL.

     -d      The operations apply to the default ACL entries instead of access
	     ACL entries.  Currently only directories may have default ACL's.

     -h      If the target of the operation is a symbolic link, perform the
	     operation on the symbolic link itself, rather than following the
	     link.

     -k      Delete any default ACL entries on the specified files.  It is not
	     considered an error if the specified files do not have any
	     default ACL entries.  An error will be reported if any of the
	     specified files cannot have a default entry (i.e. non-directo-
	     ries).

     -m entries
	     Modify the ACL entries on the specified files by adding new
	     entries and modifying existing ACL entries with the ACL entries
	     specified in entries.

     -M file
	     Modify the ACL entries on the specified files by adding new ACL
	     entries and modifying existing ACL entries with the ACL entries
	     specified in the file file.  If file is -, the input is taken
	     from stdin.

     -n      Do not recalculate the permissions associated with the ACL mask
	     entry.

     -x entries
	     Remove the ACL entries specified in entries from the access or
	     default ACL of the specified files.

     -X file
	     Remove the ACL entries specified in the file file from the access
	     or default ACL of the specified files.

     The above options are evaluated in the order specified on the command-
     line.

	     ifying the access granted to the file owning group or a specified
	     group; ``other'' or `o' specifying the access granted to any
	     process that does not match any user or group ACL entry; ``mask''
	     or `m' specifying the maximum access granted to any ACL entry
	     except the ``user'' ACL entry for the file owner and the
	     ``other'' ACL entry.

     ACL qualifier
	     The ACL qualifier field describes the user or group associated
	     with the ACL entry.  It may consist of one of the following: uid
	     or user name, gid or group name, or empty.  For ``user'' ACL
	     entries, an empty field specifies access granted to the file
	     owner.  For ``group'' ACL entries, an empty field specifies
	     access granted to the file owning group.  ``mask'' and ``other''
	     ACL entries do not use this field.

     access permissions
	     The access permissions field contains up to one of each of the
	     following: `r', `w', and `x' to set read, write, and execute per-
	     missions, respectively.  Each of these may be excluded or
	     replaced with a `-' character to indicate no access.

     A ``mask'' ACL entry is required on a file with any ACL entries other
     than the default ``user'', ``group'', and ``other'' ACL entries.  If the
     -n option is not specified and no ``mask'' ACL entry was specified, the
     setfacl utility will apply a ``mask'' ACL entry consisting of the union
     of the permissions associated with all ``group'' ACL entries in the
     resulting ACL.

     Traditional POSIX interfaces acting on file system object modes have mod-
     ified semantics in the presence of POSIX.1e extended ACLs.  When a mask
     entry is present on the access ACL of an object, the mask entry is sub-
     stituted for the group bits; this occurs in programs such as stat(1) or
     ls(1).  When the mode is modified on an object that has a mask entry, the
     changes applied to the group bits will actually be applied to the mask
     entry.  These semantics provide for greater application compatibility:
     applications modifying the mode instead of the ACL will see conservative
     behavior, limiting the effective rights granted by all of the additional
     user and group entries; this occurs in programs such as chmod(1).

     ACL entries applied from a file using the -M or -X options shall be of
     the following form: one ACL entry per line, as previously specified;
     whitespace is ignored; any text after a `#' is ignored (comments).

     When ACL entries are evaluated, the access check algorithm checks the ACL
     entries in the following order: file owner, ``user'' ACL entries, file
     owning group, ``group'' ACL entries, and ``other'' ACL entry.

     Multiple ACL entries specified on the command line are separated by com-
     mas.

DIAGNOSTICS

     The setfacl utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

	   setfacl -m u::rwx,g:mail:rw file

     Sets read, write, and execute permissions for the file owner's ACL entry
     Remove the group mail ACL entry containing read/write permissions from
     file.

	   setfacl -bn file

     Remove all ``access'' ACL entries except for the three required from
     file.

	   getfacl file1 | setfacl -b -n -M - file2

     Copy ACL entries from file1 to file2.

SEE ALSO

     getfacl(1), acl(3), getextattr(8), setextattr(8), acl(9), extattr(9)

STANDARDS

     The setfacl utility is expected to be IEEE Std 1003.2c compliant.

HISTORY

     Extended Attribute and Access Control List support was developed as part
     of the TrustedBSD Project and introduced in FreeBSD 5.0.

AUTHORS

     The setfacl utility was written by Chris D. Faulhaber <jedgar@fxp.org>.

FreeBSD 5.4			January 7, 2001 		   FreeBSD 5.4

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