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+.\" $NetBSD: netgroup.5,v 1.9 2014/09/19 16:02:58 wiz Exp $
+.\"
+.\" Copyright (c) 1992, 1993
+.\" The Regents of the University of California. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\" may be used to endorse or promote products derived from this software
+.\" without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" @(#)netgroup.5 8.2 (Berkeley) 12/11/93
+.\"
+.Dd January 16, 1999
+.Dt NETGROUP 5
+.Os
+.Sh NAME
+.Nm netgroup
+.Nd defines network groups
+.Sh SYNOPSIS
+.Nm netgroup
+.Sh DESCRIPTION
+The
+.Nm netgroup
+file
+specifies
+.Dq netgroups ,
+which are sets of
+.Sy (host, user, domain)
+tuples that are to be given similar network access.
+.Pp
+Each line in the file
+consists of a netgroup name followed by a list of the members of the
+netgroup.
+Each member can be either the name of another netgroup or a specification
+of a tuple as follows:
+.Bd -literal -offset indent
+(host, user, domain)
+.Ed
+.Pp
+where the
+.Sy host ,
+.Sy user ,
+and
+.Sy domain
+are character string names for the corresponding component.
+Any of the comma separated fields may be empty to specify a
+.Dq wildcard
+value
+or may consist of the string
+.Dq Li -
+to specify
+.Dq no valid value .
+The members of the list may be separated by whitespace;
+the
+.Dq \e
+character may be used at the end of a line to specify
+line continuation.
+The functions specified in
+.Xr getnetgrent 3
+should normally be used to access the
+.Nm netgroup
+database.
+.Pp
+If
+.Sq files
+is specified for the
+.Sq netgroup
+database in
+.Xr nsswitch.conf 5 ,
+(or no
+.Sq netgroup
+entry is specified), then these functions operate on the
+.Xr db 3
+version of the
+.Nm netgroup
+.Nm (netgroup.db)
+file which can be generated using
+.Xr netgroup_mkdb 8 .
+If
+.Sq nis
+is specified then the
+.Tn NIS
+maps
+.Sq netgroup ,
+.Sq netgroup.byhost ,
+and
+.Sq netgroup.byuser
+are used.
+.Pp
+Lines that begin with a # are treated as comments.
+.Sh FILES
+.Bl -tag -width /etc/netgroup.db -compact
+.It Pa /etc/netgroup.db
+the netgroup database.
+.El
+.Sh COMPATIBILITY
+The file format is compatible with that of various vendors, however it
+appears that not all vendors use an identical format.
+.Sh SEE ALSO
+.Xr getnetgrent 3 ,
+.Xr exports 5 ,
+.Xr nsswitch.conf 5 ,
+.Xr netgroup_mkdb 8
+.Sh BUGS
+The interpretation of access restrictions based on the member tuples of a
+netgroup is left up to the various network applications.