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Full Discussion: regex help to get unique hostnames
Top Forums Shell Programming and Scripting regex help to get unique hostnames Post 302352700 by xiamin on Sunday 13th of September 2009 01:34:35 AM
Old 09-13-2009
regex help to get unique hostnames
Hi

I have a file containing hostnames like this

Code:
(host=myhost.domain.com) or
(host=myhost)

i need to extarct the unique hostnames without the domain names from that file.
so my output should be myhost (without domain names)

But my regex skills are rusty

Code:
i tried grep "host" myfile|uniq

Code:
but this matches host=myhost.domain.com

instead of just everything after host=

any ideas on how do i construct my regex
Last edited by xiamin; 09-13-2009 at 03:31 AM..
 

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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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