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    Command:

    setfacl

    
    
    

    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 followed by another sequence of com-
           mands, ...).
    
           The options -m, and -x expect an ACL on the command line. Multiple  ACL
           entries are separated 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 permis-
           sions.
    
           The -x (--remove) and -X (--remove-file) options remove ACL entries. It
           is not an error to remove an entry which  does  not  exist.   Only  ACL
           entries  without  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, set-
           facl operates on the file mode permission bits. If the ACL does not fit
           completely  in the permission bits, setfacl modifies the file mode per-
           mission 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
    
           --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 promoted to Default ACL entries. Default ACL  entries
               in  the  input set are discarded. (A warning is issued if that hap-
               pens).
    
           --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,
               setfacl  attempts  to  restore  the  owner and owning group. If the
               input contains flags comments (which define the setuid, setgid, and
               sticky bits), setfacl sets those three bits accordingly; otherwise,
               it clears them. 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 to directories. The default
               behavior is to follow symbolic link arguments,  and  skip  symbolic
               links encountered in subdirectories.  Only effective in combination
               with -R.  This option cannot be mixed with '--restore'.
    
           -P, --physical
               Physical walk, do not follow symbolic links to  directories.   This
               also  skips symbolic link arguments.  Only effective in combination
               with -R.  This option cannot be mixed with '--restore'.
    
           -v, --version
               Print the version of setfacl and exit.
    
           -h, --help
               Print help explaining the command line options.
    
           --  End of command line options. All remaining  parameters  are  inter-
               preted 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 standard input.
    
           [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  per-
           missions: 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 contain 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 permis-
               sions 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, own-
    
           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 --access 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@bestbits.at>.
    
           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)

    
    
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