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ACL list.

=item B<$pos = $acl-E<gt>length;>

=item B<$npos = $acl-E<gt>nlength;>

Returns the number of users in the positive(-E<gt>length)
or negative(-E<gt>nlength) ACL list.

=item B<$acl-E<gt>exists(USER);>

=item B<$acl-E<gt>nexists(USER);>

Returns 1 if the given USER exists in the positive(-E<gt>exists)
or negative(-E<gt>nexists) ACL list.

=item B<$acl-E<gt>is_clean>

Returns 1 if the ACL list is clean, or 0 when the ACL list needs
cleaning.  An ACL list needs cleaning if it contains entries
referencing nonexistant PTS entries, which are represented by a
numeric ID in the ACL instead of a name.

=item B<INSTANCE METHODS>

=item S< >

=item B<$acl-E<gt>add(NEWACL);>

Adds all entries of the ACL list NEWACL to the ACL list $acl.

=item B<$ok = $acl-E<gt>apply(PATH [, FOLLOW]);>

Sets the ACL list for the given PATH. This call replaces the existing ACL
list with the new ACL list $acl.

=item B<$ok = $acl-E<gt>modifyacl(PATH, [, FOLLOW]);>

Sets the ACL to the union of the given $acl list and the current ACL
of the PATH.  An access right of I<none> or an empty string will cause
an entry to be removed from the ACL.

=back

=head1 CURRENT AUTHOR

Norbert E. Gruener E<lt>nog@MPA-Garching.MPG.deE<gt>

=head1 AUTHOR EMERITUS

Roland Schemers E<lt>schemers@slapshot.stanford.eduE<gt>

=head1 COPYRIGHT AND LICENSE

 Copyright (c) 2001-2011 Norbert E. Gruener <nog@MPA-Garching.MPG.de>.
 All rights reserved.

 Copyright (c) 1994 Board of Trustees, Leland Stanford Jr. University.
 All rights reserved.

Most of the explanations in this document are taken from the original
AFS documentation.

 AFS-3 Programmer's Reference:
 File Server/Cache Manager Interface
 Edward R. Zayas
 Copyright (c) 1991 Transarc Corporation.
 All rights reserved.

 IBM AFS Administration Reference
 Copyright (c) IBM Corporation 2000.
 All rights reserved.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=over 6

=item The original module is covered by the following copyright:

Copyright (c) 1994 Board of Trustees, Leland Stanford Jr. University

Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation,
advertising materials, and other materials related to such
distribution and use acknowledge that the software was developed
by Stanford University.  The name of the University may not be used
to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

=back

=head1 DOCUMENT VERSION

Revision $Rev: 1056 $