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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 POSIX

inet.h

<arpa/inet.h>(P)					     POSIX Programmer's Manual						  <arpa/inet.h>(P)

NAME

       arpa/inet.h - definitions for internet operations

SYNOPSIS

       #include <arpa/inet.h>

DESCRIPTION

       The in_port_t and in_addr_t types shall be defined as described in <netinet/in.h> .

       The in_addr structure shall be defined as described in <netinet/in.h> .

       The INET_ADDRSTRLEN    and INET6_ADDRSTRLEN  macros shall be defined as described in <netinet/in.h> .

       The  following  shall  either be declared as functions, defined as macros, or both. If functions are declared, function prototypes shall be
       provided.

	      uint32_t htonl(uint32_t);
	      uint16_t htons(uint16_t);
	      uint32_t ntohl(uint32_t);
	      uint16_t ntohs(uint16_t);

       The uint32_t and uint16_t types shall be defined as described in <inttypes.h> .

       The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

	      in_addr_t    inet_addr(const char *);
	      char	  *inet_ntoa(struct in_addr);
	      const char  *inet_ntop(int, const void *restrict, char *restrict,
			       socklen_t);
	      int	   inet_pton(int, const char *restrict, void *restrict);

       Inclusion of the <arpa/inet.h> header may also make visible all symbols from <netinet/in.h> and <inttypes.h>.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <netinet/in.h> , <inttypes.h> , the System Interfaces volume of IEEE Std 1003.1-2001, htonl(), inet_addr()

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							  <arpa/inet.h>(P)
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