GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  REVNETGROUP (8)

NAME

revnetgroup - generate reverse netgroup data

CONTENTS

Synopsis
Description
Options
Files
See Also
Authors

SYNOPSIS

revnetgroup -u -| -h [-f netgroup_file]

DESCRIPTION

The revnetgroup utility processes the contents of a file in netgroup(5) format into what is called 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 netgroup.byuser and netgroup.byhost NIS maps. These reverse netgroup maps are used to help speed up netgroup lookups, particularly for the innetgr library function.

For example, the standard /etc/netgroup file may list a netgroup and a list of its members. Here, the netgroup is considered the key and the member names are the data. By contrast, the reverse netgroup.byuser 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.

By constructing these reverse netgroup databases (and the corresponding NIS maps) in advance, the 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.

The revnetgroup utility prints its results on the standard output. It is usually called only by /var/yp/Makefile when rebuilding the NIS netgroup maps.

OPTIONS

The revnetgroup utility supports the following options:
-u Generate netgroup.byuser output; only username information in the original netgroup file is processed.
-h Generate netgroup.byhost output; only hostname information in the original netgroup file is processed. (Note at least one of the -u or -h flags must be specified.)
[-f netgroup_file]
  The revnetgroup utility uses /etc/netgroup as its default input file. The -f flag allows the user to specify an alternate input file. Specifying ‘‘-’’ as the input file causes revnetgroup to read from the standard input.

FILES

/var/yp/Makefile
  the Makefile that calls yp_mkdb and revnetgroup to build the NIS databases
/etc/netgroup the default netgroup database file. This file is most often found only on the NIS master server

SEE ALSO

getnetgrent(3), netgroup(5), yp(8), yp_mkdb(8)

AUTHORS


.An Bill Paul Aq wpaul@ctr.columbia.edu
Search for    or go to Top of page |  Section 8 |  Main Index


Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.