Clueless about how to lookup and reverse lookup IP addresses under a file!!.pls help

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revnetgroup

REVNETGROUP(8)						       NIS Reference Manual						    REVNETGROUP(8)

NAME

       revnetgroup - generate reverse netgroup data

SYNOPSIS

       /usr/lib/yp/revnetgroup [-u | -h]

DESCRIPTION

       Revnetgroup processes the standard input 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.byhosts NIS maps. These reverse
       netgroup maps are used to help speed up netgroup lookups, particularly for the innetgr() library function.

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

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.

FILES

       /var/yp/Makefile
	   The Makefile 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),

AUTHOR

       revnetgroup was written by Thorsten Kukuk <kukuk@linux-nis.org>.

NIS Reference Manual						    09/26/2007							    REVNETGROUP(8)

UNIX for Advanced & Expert Users