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+.\" Copyright (c) 1995
+.\"	Bill Paul <wpaul@ctr.columbia.edu>.  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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by Bill Paul.
+.\" 4. 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 Bill Paul 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 Bill Paul 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.
+.\"
+.\"	$Id$
+.\"
+.Dd October 24, 1995
+.Dt REVNETGROUP 8
+.Os
+.Sh NAME
+.Nm revnetgroup
+.Nd "generate reverse netgroup data"
+.Sh SYNOPSIS
+.Nm revnetgroup
+.Fl u
+.Fl h
+.Op Fl f Ar netgroup_file
+.Sh DESCRIPTION
+.Nm revnetgroup
+processes the contents of a file in
+.Xr netgroup 5
+format into what is called
+.Pa reverse netgroup
+form. That is, where the original file shows
+netgroup memberships in terms of which members reside in a particular
+group, the reverse netgroup format specifies what groups are associated
+with a particular member. This information is used to generate the
+.Nm netgroup.byuser
+and
+.Nm netgroup.byhosts
+NIS maps. These reverse netgroup maps are used to help speed up
+netgroup lookups, particularly for the
+.Fn innetgr
+library function.
+.Pp
+For example, the standard
+.Nm /etc/netgroup
+file may list a netgroup and a list of its members. Here, the
+netgroup is considered the
+.Pa key
+and the member names are the
+.Pa data .
+By contrast, the reverse
+.Nm netgroup.byusers
+database lists each unique
+member as the key and the netgroups to which the members belong become
+the data. Seperate databases are created to hold information pertaining
+to users and hosts; this allows netgroup username lookups
+and netgroup hostname lookups to be performed using independent keyspaces.
+.Pp
+By constructing these reverse netgroup databases (and the corresponding
+NIS maps) in advance, the
+.Xr getnetgrent 3
+library functions are spared from having to work out the dependencies
+themselves on the fly. This is important on networks with large numbers
+of users and hosts, since it can take a considerable amount of time
+to process very large netgroup databases.
+.Pp
+The
+.Nm revnetgroup
+command prints its results on the standard output. It is usually called
+only by
+.Nm /var/yp/Makefile
+when rebuilding the NIS netgroup maps.
+.Pp
+.Sh OPTIONS
+The
+.Nm revnetgroup
+command supports the following options:
+.Bl -tag -width flag
+.It Fl u
+Generate netgroup.byuser output; only username information in the
+original netgroup file is processed.
+.It Fl h
+Generate netgroup.byhost output; only hostname information in the
+original netgroup file is processed. (Note at least one of the
+.Fl u
+or
+.Fl h
+flags must be specified.)
+.It Op Fl f Ar netgroup_file
+The
+.Nm revnetgroup
+command uses
+.Nm /etc/netgroup
+as its default input file. The
+.Fl f
+flag allows the user to specify an alternate input file. Specifying ``-''
+as the input file causes
+.Nm revnetgroup
+to read from the standard input.
+.El
+.Sh FILES
+.Bl -tag -width Pa -compact
+.It Pa /var/yp/Makefile
+The Makefile that calls
+.Nm yp_mkdb
+and
+.Nm revnetgroup
+to build the NIS databases.
+.It Pa /etc/netgroup
+The default netgroup database file. This file is most often found
+only on the NIS master server.
+.El
+.Sh SEE ALSO
+.Xr yp 4 ,
+.Xr netgroup 5 ,
+.Xr yp_mkdb 8 ,
+.Xr getnetgrent 3
+.Sh AUTHOR
+Bill Paul <wpaul@ctr.columbia.edu>