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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 OSF1

res_mkquery

res_mkquery(3)						     Library Functions Manual						    res_mkquery(3)

NAME

       res_mkquery - Makes query messages for name servers

LIBRARY

       Standard C Library (libc.a, libc.so)

SYNOPSIS

       #include <sys/types.h> #include <netinet/in.h> #include <arpa/nameser.h> #include <resolv.h>
       int  res_mkquery  (	 int  query_type,	const  u_char *domain_name,	 int class,	 int type,	const char *data,      int
       data_length,	 const u_char *reserved,      u_char *buffer,	   int buf_length );

PARAMETERS

       Specifies a query type.	The usual type is QUERY, but the parameter can be set to any of the query  types  defined  in  the  arpa/nameser.h
       file.   Points  to the name of the domain.  If the domain_name parameter points to a single label and the RES_DEFNAMES bit is set, as it is
       by default, the function appends domain_name to the current domain name.  The current domain name is defined by the name server in  use	or
       in the /etc/resolv.conf file.  Specifies one of the following parameters: Specifies the ARPA Internet.  Specifies the Chaos network at MIT.
       Requires one of the following values: Host address Authoritative server Mail destination Mail forwarder Canonical name Start  of  authority
       zone  Mailbox  domain  name Mail group member Mail rename name NULL resource record Well known service Domain name pointer Host information
       Mailbox information Mail routing information User (finger) information User ID Group ID Points to the data that is sent to the name  server
       as  a  search  key.  The data is stored as a character array.  Defines the size of the array pointed to by the data parameter.  Specifies a
       reserved and currently unused parameter.  Points to a location containing the query message.  Specifies the length of the  message  pointed
       to by the buffer parameter.

DESCRIPTION

       The  res_mkquery()  function makes packets for name servers in the Internet domain.  The res_mkquery() function makes a standard query mes-
       sage and places it in the location pointed to by the buffer parameter.

       The res_mkquery() function is one of a set of subroutines that form the resolver, a set of functions that  resolve  domain  names.   Global
       information  that is used by the resolver functions is kept in the _res data structure.	The  /include/resolv.h file contains the _res data
       structure definition.

RETURN VALUES

       Upon successful completion, the res_mkquery() function returns the size of the query. If  the  query  is  larger  than  the  value  of  the
       buf_length parameter, the function fails and returns a value of -1.

ERRORS

       If  an  error  occurs  during  a  resolver  operation,  the h_errno external variable is set.  Error code values and reasons are defined in
       <netdb.h>.

FILES

       Contains the name server and domain name.

RELATED INFORMATION

       Functions:  dn_comp(3),	dn_expand(3),  dn_find(3),  dn_skipname(3),  _getlong(3),  _getshort(3),  putlong(3),  putshort(3),   res_init(3),
       res_query(3), res_search(3), res_send(3).  delim off

																    res_mkquery(3)
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