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Full Discussion: FQDN into domain name and hostname
Top Forums Shell Programming and Scripting FQDN into domain name and hostname Post 302461097 by msarro on Friday 8th of October 2010 01:28:11 PM
Old 10-08-2010
FQDN into domain name and hostname
I'm working on a rather large script atm (it already takes 9 arguments). As such, I need to obtain both a server name and domain from the FQDN. From this, I want to both populate the hostname of the server, as well as the domain line in the /etc/resolv.conf file.

Obviously, this isn't working. I know the regex should be correct.
Here are the regex's I'm working with to obtain the hostname and domain portions:
Code:
Domain: /(?<=\.)[[:graph:]]*/
Hostname: /[[:alnum:]]*(?=\.)/

Can anyone recommend an implementation using either sed or perl? Once I have them output to stdout I can cast them into variables, or even directly into the files. I'd appreciate any help anyone can offer. Thanks!
 

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LEARN ABOUT MINIX

resolvxc

RESOLV.CONF(5)							File Formats Manual						    RESOLV.CONF(5)

NAME

       resolv.conf - Domain Name System resolver configuration

SYNOPSIS

       /etc/resolv.conf

DESCRIPTION

       The  /etc/resolv.conf  is used to configure how the host will use the Domain Name System to resolve hostnames to IP addresses.  It may con-
       tain these two lines:

	      nameserver     IP-address
	      domain	     domain-name

       The nameserver entry tells the IP address of the host to use for DNS queries.  If it is set to 127.0.0.1 (which is the  default)  then  the
       local  name  daemon is used that may use the /etc/hosts database to translate host names.  You normally only need a nameserver entry if the
       name server is at the other side of a router.  The default nonamed name server can't look beyond the local network.

       The domain entry tells the default domain to use for unqualified hostnames.  This entry is usually not given in which case  the	domain	of
       the local host is used.

       The long version of this story can be found in resolver(5).

FILES

       /etc/resolv.conf    DNS resolver configuration file.

SEE ALSO

       resolver(5), hosts(5), nonamed(8), boot(8).

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																    RESOLV.CONF(5)
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