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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 OPENSOLARIS

nodename

nodename(4)							   File Formats 						       nodename(4)

NAME

       nodename - local source for system name

SYNOPSIS

       /etc/nodename

DESCRIPTION

       When  a	machine is standalone or its IP address is configured locally, the /etc/nodename file contains the system name. By convention, the
       system name is the same as the hostname associated with the IP address of the primary network interface, for example, hostname.hme0.

       If the machine's network configuration is delivered by the RPC bootparams protocol, the /etc/nodename file is not used, as the system  name
       is delivered by the remote service.

       Given a system name value, regardless of source, the uname utility invoked with the -S option is used to set the system name of the running
       system.

       If the machine's network configuration is delivered by the DHCP protocol, the /etc/nodename file is used only if the DHCP server  does  not
       provide a value for the Hostname option (DHCP standard option code 12).

       A system name configured in /etc/nodename should be unique within the system's name service domain in order to ensure that any network ser-
       vices provided by the system will operate correctly.

       Given a system name value, regardless of source, the uname utility invoked with the -S option is used to set the system name of the running
       system.

EXAMPLES

       Example 1 Syntax

       The syntax for nodename consists of a single line containing the system's name. For example, for a system named myhost:

	 myhost

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       NIS+(1), uname(1), named(1M), ypbind(1M), attributes(5)

NOTES

       The nodename file is modified by Solaris installation and de-installation scripts.

SunOS 5.11							    9 Feb 2004							       nodename(4)
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