152 lines
4.6 KiB
Groff
152 lines
4.6 KiB
Groff
.\" 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: revnetgroup.8,v 1.4 1997/02/22 14:22:03 peter Exp $
|
|
.\"
|
|
.Dd October 24, 1995
|
|
.Dt REVNETGROUP 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm revnetgroup
|
|
.Nd "generate reverse netgroup data"
|
|
.Sh SYNOPSIS
|
|
.Nm revnetgroup
|
|
.Fl u
|
|
.Op Fl f Ar netgroup_file
|
|
.Nm revnetgroup
|
|
.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
|
|
.Pa netgroup.byuser
|
|
and
|
|
.Pa netgroup.byhosts
|
|
.Tn 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
|
|
.Pa /etc/netgroup
|
|
file may list a netgroup and a list of its members. Here, the
|
|
netgroup is considered the
|
|
.Em key
|
|
and the member names are the
|
|
.Em data .
|
|
By contrast, the reverse
|
|
.Pa 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
|
|
.Tn 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
|
|
command prints its results on the standard output. It is usually called
|
|
only by
|
|
.Pa /var/yp/Makefile
|
|
when rebuilding the
|
|
.Tn NIS
|
|
netgroup maps.
|
|
.Pp
|
|
.Sh OPTIONS
|
|
The
|
|
.Nm
|
|
command supports the following options:
|
|
.Bl -tag -width indent
|
|
.It Fl u
|
|
Generate
|
|
.Pa netgroup.byuser
|
|
output; only username information in the
|
|
original netgroup file is processed.
|
|
.It Fl h
|
|
Generate
|
|
.Pa 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
|
|
command uses
|
|
.Pa /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
|
|
to read from the standard input.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /var/yp/Makefile -compact
|
|
.It Pa /var/yp/Makefile
|
|
the Makefile that calls
|
|
.Nm yp_mkdb
|
|
and
|
|
.Nm revnetgroup
|
|
to build the
|
|
.Tn NIS
|
|
databases
|
|
.It Pa /etc/netgroup
|
|
the default netgroup database file. This file is most often found
|
|
only on the
|
|
.Tn NIS
|
|
master server
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr getnetgrent 3 ,
|
|
.Xr yp 4 ,
|
|
.Xr netgroup 5 ,
|
|
.Xr yp_mkdb 8
|
|
.Sh AUTHOR
|
|
.An Bill Paul Aq wpaul@ctr.columbia.edu
|