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\"      Bill Paul <[email protected]>.  All rights reserved.
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Dd February 26, 2005
Dt REVNETGROUP 8
Os
Sh NAME
Nm revnetgroup
Nd generate reverse netgroup data
Sh SYNOPSIS
Nm
Op Fl hu
Op Fl f Ar netgroup_file
Sh DESCRIPTION
Nm
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
Pa key
and the member names are the
Pa 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. Separate 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/<domain>/Makefile
when rebuilding the
Tn NIS
netgroup maps.
Sh OPTIONS
The
Nm
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
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 Pa -compact
It Pa /var/yp/<domain>/Makefile
The Makefile that calls
Nm makedbm
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 netgroup 5 ,
Xr makedbm 8 ,
Xr nis 8
Sh AUTHORS
An Bill Paul Aq Mt [email protected]

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