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Full Discussion: How to use cat grep and cut together?
Top Forums UNIX for Beginners Questions & Answers How to use cat grep and cut together? Post 303044552 by synack on Wednesday 26th of February 2020 09:39:54 AM
Old 02-26-2020
How to use cat grep and cut together?
Hello,

I try to

Code:
#!/bin/bash

for ip in $(seq 1 255  );do
    host 10.11.1.$ip >> nameserver2.txt
done

I'm trying to clean up a file I created with this little batch script.

I have more results with names of servers found and not found.
Host 1.1.11.10.in-addr.arpa. not found: 3 (NXDOMAIN)
Host 2.1.11.10.in-addr.arpa. not found: 3 (NXDOMAIN)

I'm doing a nameserver2.txt grep | grep name which displays only existing servers. Except that I have too much information on each line
5.1.11.10.in-addr.arpa domain name pointer serv1.domain.com
6.1.11.10.in-addr.arpa domain name pointer serv2.domain.com


I would like to have only the 1st character each line (so the last of each IP and the name of the server
I'm making a

Code:
cat nameserver2.txt | grep name | cut -d. -f1

but in this case I only have information on two so in the end I made this order:

Code:
cat nameserver.txt | grep name | cut -d. -f1.6 | cut -d '' -f1.5

which therefore results:

5.arpa srv1
6.arpa srv2

I can't delete .arpa.

How can I do ?
 

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LEARN ABOUT SUSE

mail::spf::util

Mail::SPF::Util(3)					User Contributed Perl Documentation					Mail::SPF::Util(3)

NAME

       Mail::SPF::Util - Mail::SPF utility class

SYNOPSIS

	   use Mail::SPF::Util;

	   $hostname = Mail::SPF::Util->hostname;

	   $ipv6_address_v4mapped =
	       Mail::SPF::Util->ipv4_address_to_ipv6($ipv4_address);

	   $ipv4_address =
	       Mail::SPF::Util->ipv6_address_to_ipv4($ipv6_address_v4mapped);

	   $is_v4mapped =
	       Mail::SPF::Util->ipv6_address_is_ipv4_mapped($ipv6_address);

	   $ip_address_string  = Mail::SPF::Util->ip_address_to_string($ip_address);
	   $reverse_name       = Mail::SPF::Util->ip_address_reverse($ip_address);

	   $validated_domain = Mail::SPF::Util->valid_domain_for_ip_address(
	       $spf_server, $request,
	       $ip_address, $domain,
	       $find_best_match,       # defaults to false
	       $accept_any_domain      # defaults to false
	   );

DESCRIPTION

       Mail::SPF::Util is Mail::SPF's utility class.

   Class methods
       The following class methods are provided:

       hostname: returns string
	   Returns the fully qualified domain name (FQDN) of the local host.

       ipv4_address_to_ipv6($ipv4_address): returns NetAddr::IP; throws Mail::SPF::EInvalidOptionValue
	   Converts the specified NetAddr::IP IPv4 address into an IPv4-mapped IPv6 address.  Throws a Mail::SPF::EInvalidOptionValue exception if
	   the specified IP address is not an IPv4 address.

       ipv6_address_to_ipv4($ipv6_address): returns NetAddr::IP; throws Mail::SPF::EInvalidOptionValue
	   Converts the specified NetAddr::IP IPv4-mapped IPv6 address into a proper IPv4 address.  Throws a Mail::SPF::EInvalidOptionValue
	   exception if the specified IP address is not an IPv4-mapped IPv6 address.

       ipv6_address_is_ipv4_mapped($ipv6_address): returns boolean
	   Returns true if the specified NetAddr::IP IPv6 address is an IPv4-mapped address, false otherwise.

       ip_address_to_string($ip_address): returns string; throws Mail::SPF::EInvalidOptionValue
	   Returns the given NetAddr::IP IPv4 or IPv6 address compactly formatted as a string.	For IPv4 addresses, this is equivalent to calling
	   NetAddr::IP's "addr"  method.  For IPv6 addresses, this is equivalent to calling  NetAddr::IP's "short"  method.  Throws a
	   Mail::SPF::EInvalidOptionValue exception if the specified object is not a NetAddr::IP IPv4 or IPv6 address object.

       ip_address_reverse($ip_address): returns string; throws Mail::SPF::EInvalidOptionValue
	   Returns the "in-addr.arpa."/"ip6.arpa." reverse notation of the given NetAddr::IP IPv4 or IPv6 address.  Throws a
	   Mail::SPF::EInvalidOptionValue exception if the specified object is not a NetAddr::IP IPv4 or IPv6 address object.

       valid_domain_for_ip_address($server, $request, $ip_address, $domain, $find_best_match = false, $accept_any_domain = false): returns string
       or undef
	   Finds a valid domain name for the given NetAddr::IP IP address that matches the given domain or a sub-domain thereof.  A domain name is
	   valid for the given IP address if the IP address reverse-maps to that domain name in DNS, and the domain name in turn forward-maps to
	   the IP address.  Uses the given Mail::SPF::Server and Mail::SPF::Request objects to perform DNS look-ups.  Returns the validated domain
	   name.

	   If $find_best_match is true, the one domain name is selected that best matches the given domain name, preferring direct matches over
	   sub-domain matches.	Defaults to false.

	   If $accept_any_domain is true, any domain names are considered acceptable, even if they differ completely from the given domain name
	   (which is then effectively unused unless a best match is requested).  Defaults to false.

SEE ALSO

       Mail::SPF

       For availability, support, and license information, see the README file included with Mail::SPF.

AUTHORS

       Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>

perl v5.12.1							    2010-07-05							Mail::SPF::Util(3)
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