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Man Pages
dns-hosts(1) FreeBSD General Commands Manual dns-hosts(1)

dns-hosts - generate /etc/hosts entries from DNS tables

dns-hosts [ option... ][ infile [ outfile ]]
dns-hosts -Help
dns-hosts -VERSion

The dns-hosts program is used to generate the /etc/hosts entries from DNS tables.

If the input file is not named, or the name '-' is used, the standard input is read.

If the output file is not named, or the name '-' is used, the startdard output is written.

The following options are understood:
-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 preceeding SOA record.
-Verbose

This option may be used to see what dns-hosts deciphers each resource record as.
-Help

This option may be used to get more information about how to used th dns-hosts program.
-VERSion

This option may be used to see what version of the dns-hosts program is running.
-Idirectory

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

See the file man1/arglex.so.

See the file man1/exit.so.

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.

Given a database file called ``example.com'' and which contains the following text


See the file man1/example.so.

You can generate the /etc/ethers file using the following command
% dns-hosts example.com /etc/ethers
%
Here is what you would see as the output

See the file man1/example.hosts.so.

Note that the output uses relative names.

All of this can be automated using the following makefile fragment:
/etc/hosts: example.com
        dns-hosts example.com $@
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.

See the file man1/copyright.so.

See the file man1/author.so.

dnsutl Reference Manual

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