👤
Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:
Select Section of Man Page:
Select Man Page Repository:

RedHat 9 (Linux i386) - man page for setfacl (redhat section 1)

SETFACL(1)			       Access Control Lists			       SETFACL(1)

NAME
       setfacl - set file access control lists

SYNOPSIS
       setfacl [-bkndRLPvh] [{-m|-x} acl_spec] [{-M|-X} acl_file] file ...

       setfacl --restore=file


DESCRIPTION
       This  utility  sets  Access Control Lists (ACLs) of files and directories.  On the command
       line, a sequence of commands is followed by a sequence of files (which in turn can be fol-
       lowed by another sequence of commands, ...).

       The  options  -m, and -x expect an ACL on the command line. Multiple ACL entries are sepa-
       rated by comma characters (`,'). The options -M, and -X read an ACL from a  file  or  from
       standard input. The ACL entry format is described in Section ACL ENTRIES.

       The --set and --set-file options set the ACL of a file or a directory. The previous ACL is
       replaced.  ACL entries for this operation must include permissions.

       The -m (--modify) and -M (--modify-file) options modify the ACL of a  file  or  directory.
       ACL entries for this operation must include permissions.

       The -x (--remove) and -X (--remove-file) options remove ACL enries. Only ACL entries with-
       out the perms field are accepted as parameters, unless POSIXLY_CORRECT is defined.

       When reading from files using the -M, and -X options, setfacl accepts the  output  getfacl
       produces.   There  is at most one ACL entry per line. After a Pound sign (`#'), everything
       up to the end of the line is treated as a comment.

       If setfacl is used on a file system which does not support ACLs, setfacl operates  on  the
       file mode permission bits. If the ACL does not fit completely in the permission bits, set-
       facl modifies the file mode permission bits to reflect the ACL  as  closely  as	possible,
       writes an error message to standard error, and returns with an exit status greater than 0.

   PERMISSIONS
       The file owner and processes capable of CAP_FOWNER are granted the right to modify ACLs of
       a file. This is analogous to the permissions required for accessing  the  file  mode.  (On
       current Linux systems, root is the only user with the CAP_FOWNER capability.)

   OPTIONS
       -b, --remove-all
	   Remove  all	extended ACL entries. The base ACL entries of the owner, group and others
	   are retained.

       -k, --remove-default
	   Remove the Default ACL. If no Default ACL exists, no warnings are issued.

       -n, --no-mask
	   Do not recalculate the effective rights mask. The default behavior of  setfacl  is  to
	   recalculate	the  ACL  mask entry, unless a mask entry was explicitly given.  The mask
	   entry is set to the union of all permissions of the owning group, and all  named  user
	   and group entries. (These are exactly the entries affected by the mask entry).

       --mask
	   Do  recalculate  the  effective  rights mask, even if an ACL mask entry was explicitly
	   given. (See the -n option.)

       -d, --default
	   All operations apply to the Default ACL. Regular ACL entries in the input set are pro-
	   moted  to  Default ACL entries. Default ACL entries in the input set are discarded. (A
	   warning is issued if that happens).

       --restore=file
	   Restore a permission backup created by `getfacl -R' or similar. All permissions  of	a
	   complete  directory	subtree  are restored using this mechanism. If the input contains
	   owner comments or group comments, and setfacl is run by root,  the  owner  and  owning
	   group  of  all  files  are  restored  as  well. This option cannot be mixed with other
	   options except `--test'.

       --test
	   Test mode. Instead of changing the ACLs of any files, the resulting ACLs are listed.

       -R, --recursive
	   Apply operations to all files and directories recursively. This option cannot be mixed
	   with `--restore'.

       -L, --logical
	   Logical  walk,  follow symbolic links. The default behavior is to follow symbolic link
	   arguments, and to skip symbolic links encountered in subdirectories. This option  can-
	   not be mixed with `--restore'.

       -P, --physical
	   Physical walk, skip all symbolic links. This also skips symbolic link arguments.  This
	   option cannot be mixed with `--restore'.

       --version
	   Print the version of setfacl and exit.

       --help
	   Print help explaining the command line options.

       --  End of command line options. All remaining parameters are interpreted as  file  names,
	   even if they start with a dash.

       -   If  the file name parameter is a single dash, setfacl reads a list of files from stan-
	   dard input.

   ACL ENTRIES
       The setfacl utility recognizes the following ACL entry formats (blanks inserted for  clar-
       ity):

       [d[efault]:] [u[ser]:]uid [:perms]
	      Permissions of a named user. Permissions of the file owner if uid is empty.

       [d[efault]:] g[roup]:gid [:perms]
	      Permissions of a named group. Permissions of the owning group if gid is empty.

       [d[efault]:] m[ask][:] [:perms]
	      Effective rights mask

       [d[efault]:] o[ther][:] [:perms]
	      Permissions of others.

       Whitespace between delimiter characters and non-delimiter characters is ignored.

       Proper  ACL  entries including permissions are used in modify and set operations. (options
       -m, -M, --set and --set-file).  Entries without the perms field are used for  deletion  of
       entries (options -x and -X).

       For uid and gid you can specify either a name or a number.

       The  perms  field  is a combination of characters that indicate the permissions: read (r),
       write (w), execute (x), execute only if the file is a directory	or  already  has  execute
       permission for some user (X).  Alternatively, the perms field can be an octal digit (0-7).

   AUTOMATICALLY CREATED ENTRIES
       Initially,  files  and  directories contain only the three base ACL entries for the owner,
       the group, and others. There are some rules that need to be satisfied in order for an  ACL
       to be valid:

       *   The	three  base entries cannot be removed. There must be exactly one entry of each of
	   these base entry types.

       *   Whenever an ACL contains named user entries or named group objects, it must also  con-
	   tain an effective rights mask.

       *   Whenever  an  ACL contains any Default ACL entries, the three Default ACL base entries
	   (default owner, default group, and default others) must also exist.

       *   Whenever a Default ACL contains named user entries or named	group  objects,  it  must
	   also contain a default effective rights mask.

       To  help  the user ensure these rules, setfacl creates entries from existing entries under
       the following conditions:

       *   If an ACL contains named user or named group entries, and no mask entry exists, a mask
	   entry  containing  the  same  permissions as the group entry is created. Unless the -n
	   option is given, the permissions of the mask entry are further adjusted to include the
	   union of all permissions affected by the mask entry. (See the -n option description).

       *   If  a  Default  ACL	entry  is  created, and the Default ACL contains no owner, owning
	   group, or others entry, a copy of the ACL owner, owning  group,  or	others	entry  is
	   added to the Default ACL.

       *   If a Default ACL contains named user entries or named group entries, and no mask entry
	   exists, a mask entry containing the same permissions  as  the  default  Default  ACL's
	   group entry is added. Unless the -n option is given, the permissions of the mask entry
	   are further adjusted to inclu de the union of all permissions  affected  by	the  mask
	   entry. (See the -n option description).

EXAMPLES
       Granting an additional user read access
	      setfacl -m u:lisa:r file

       Revoking  write	access	from  all  groups and all named users (using the effective rights
       mask)
	      setfacl -m m::rx file

       Removing a named group entry from a file's ACL
	      setfacl -x g:staff file

       Copying the ACL of one file to another
	      getfacl file1 | setfacl --set-file=- file2

       Copying the access ACL into the Default ACL
	      getfacl -a dir | setfacl -d -M- dir

CONFORMANCE TO POSIX 1003.1e DRAFT STANDARD 17
       If the environment variable POSIXLY_CORRECT is defined, the default  behavior  of  setfacl
       changes	as  follows:  All  non-standard options are disabled.  The ``default:'' prefix is
       disabled.  The -x and -X options also accept permission fields (and ignore them).

AUTHOR
       Andreas Gruenbacher, <a.gruenbacher@computer.org>.

       Please send your bug reports, suggested features and comments to the above address.

SEE ALSO
       getfacl(1), chmod(1), umask(1), acl(5)

May 2000				ACL File Utilities			       SETFACL(1)


All times are GMT -4. The time now is 08:38 PM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password