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dns-ng(1)		     General Commands Manual		       dns-ng(1)

NAME
     dns-ng - generate /etc/netgroup entries from DNS tables

SYNOPSIS
     dns-ng [ option...  ][ infile [ outfile ]]
     dns-ng -Help
     dns-ng -VERSion

DESCRIPTION
     The  dns-ng  program  is used to generate a netgroup file from DNS informa-
     tion.

     Each host is given a netgroup.  Higher-level netgroups can be created  from
     patterns applied to the HINFO field.

OPTIONS
     The following options are understood:

     -Help
	     Provide some help with using the dns-ng program.

     -VERSion
	     Print the version of the dns-ng program being executed.

     -Group name pattern
	     In  addition to one netgroup for each host, a netgroup of the given
	     name will be created for all hosts with a second HINFO field match-
	     ing the given pattern.  This option  may  be  specified  more  than
	     once.   The  first  pattern  match  found is used, machines are not
	     placed in more than one of these groups.  Patterns are regular  ex-
	     pressions.

     -Delete_Foreign_Names
	     This  option may be used to delete A and NS records which reference
	     names in domains outside the domain specified in the  closest  pre-
	     ceeding SOA record.

     -Idirectory
	     This option may be used to set the search path for include files.

EXAMPLE
     The  idea	is that you have all of the information concerning each computer
     in the one file.  This makes it less likely that something will be omitted,
     and simpler to change if the name or IP address changes.

     By using netgroups, you can assign NFS mount permissions (the  /etc/exports
     file)  and rlogin permissions (the /etc/hosts.equiv file) based on the kind
     of machine they are.

     Given a database file called ``example.com'' and which contains the follow-
     ing text
     You can generate the /etc/netgroup file using the following command
	    % dns-ng example.com /etc/netgroup \
		    -g pc MSDOS -g mac MacOS \
		    -g unix UNIX -g other '.*'
	    %
     Here is what you would see as the output
     Note that the output uses relative names.

   Makefile
     All of this can be automated using the following makefile fragment:
	    /etc/netgroup: example.com
		    dns-ng example.com $@ -g pc MSDOS \
			    -g mac MacOS -g unix UNIX -g other '.*'
     By doing this, all you need to do is edit the example.com file, and the use
     the make(1) command to bring everything up-to-date.

     If you were using NIS, NIS+ or LDAP you would update them, rather than  the
     static  file,  especially	since on many systems the static file doesn't do
     anything.

Reference Manual		     dnsutl			       dns-ng(1)

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