awk script modification Post: 302686691

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Top Forums Shell Programming and Scripting awk script modification Post 302686691 by SkySmart on Wednesday 15th of August 2012 09:02:11 AM

08-15-2012

Registered User

awk script modification

I want the below script to omit every chunk of data that contains a specific hostname.

here's the scenario. i have a configuration file that contains the configuration of several hosts. a sample of this configuration file is this:

Code:

define host {
        address                       10.70.40.40
        host_name                     relay-nasty-01.net
        use                           generic-host
}

define host {
        address                       10.70.40.42
        host_name                     relay-nasty-02.net
        use                           generic-host
}

define host {
        address                       10.70.40.43
        host_name                     relay-nasty-03.net
        use                           generic-host
}

The above is the configuration for Three hosts: relay-nasty-01.net, relay-nasty-02.net, relay-nasty-03.net.

now, this configuration data is quite huge, since it contains information for several hosts.

now, i want to scan this configuration file against a list of host names. and if any of the hostname in this list is found in the configuration file, i want information about that host name to be omitted. I want a new configuration file created without the configuration for that host name(s).

so for example, if relay-nasty-02.net was in the list of hostnames i want to remove from the configuration file, i want a script that will scan the configuration and output EVERYTHING ELSE BUT the configuration for relay-nasty-02.net.

below is a script i was working on. but i dont know how to modify it to do what i specified above.

Code:

awk 'BEGIN {
  while((getline < "/tmp/host_list.txt")>0)
     S[$0]

  FS="\n"; RS="}\n"; ORS="}\n";
}

/define host/ {

  for(X in D) delete D[X];

  for(N=2; N<=NF; N++)
  {
       split($N, A, " ");
       D[A[1]]=A[2];
  }

  if (D["host_name"] in S)
       printf("%s -------- %s -------- %s\n", D["host_name"]" " " ", D["address"], D["_secondary_address"])

}' /tmp/hosts.conf

so basically, i would like to modify this script to make it so, when i scan it against the configuration file, it will omit the configuration setup of the host(s) in the list i give it.

so in my example, if i run this script, it should only output the below, because relay-nasty-02.net was in the list of hosts i gave it.

Code:

define host {
        address                       10.70.40.40
        host_name                     relay-nasty-01.net
        use                           generic-host
}


define host {
        address                       10.70.40.43
        host_name                     relay-nasty-03.net
        use                           generic-host
}

OS: linux/sun
shell: bash

SkySmart

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