Login or Register to Ask a Question and Join Our Community

Sponsored Content
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 ?
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

cat and grep not working

I am trying to cat a file and then grep that file for a number. I can do it fine on other files but this particular file will not do anything. I tried running it on an older file from the same device but it is just not working. The file is nothing more than a flat file on a unix box. Here is just a... (3 Replies)
Discussion started by: jphess
3 Replies

2. UNIX for Dummies Questions & Answers

cat, grep and tee to a local file

Hi, This is what I am trying to do. 1) connect to 3 remote servers from my local machine serverA serverB serverC 2) read error file from each server cat /var/lib/mysql/mydb.err 3) grep for lines displaying "yesterday" date grep "`date +%y%m%d' '-d\"1 day ago\"`" 4) Append those lines to a... (7 Replies)
Discussion started by: shantanuo
7 Replies

3. Shell Programming and Scripting

cat or cut to delimit csv?

Hi, Im a pretty large noob to linux/perl etc and im trying to use mysql slurp to take a delimited file and import it into mysql using stdin (in the hope its faster) mysqlslurp - slurp <STDIN> into a MySQL table - search.cpan.org Christopher Brown / MySQL-Slurp - search.cpan.org Using... (3 Replies)
Discussion started by: newtony
3 Replies

4. Shell Programming and Scripting

cat /etc/passwd and grep -v on /etc/shells

Hi All, I'd like to do this cat /etc/passwd and grep -v on the /etc/shells list I'd like to find all shell that doesn't exist on the /etc/passwd. Is there an easy way without doing a egrep -v "/bin/sh|/bin/bash................"? How do I use a file /etc/shells as my list for... (4 Replies)
Discussion started by: itik
4 Replies

5. Shell Programming and Scripting

cat -n and grep

I am not sure if using cat -n is the most efficient way to split a file into multiple files, one file per line in the source file. I thought using cat -n would make it easy to process the file because it produces an output that numbers each line that I could then grep for with the regex "^ *$i".... (3 Replies)
Discussion started by: kapu
3 Replies

6. Shell Programming and Scripting

grep or cat using sed

Is there a way using grep or cat a file to create a new file based on whether the first 9 positions of each record is less than 399999999? This is a fixed file format. (3 Replies)
Discussion started by: ski
3 Replies

7. Slackware

How should I cut this line using cut and grep?

not sure how to do it. wan't to delete it using cut and grep ince i would use it in the shell. but how must the command be? grep "64.233.181.103 wwwGoogle.com" /etc/hosts | cut -d the delimeter is just a space. can you help meplease. :D (1 Reply)
Discussion started by: garfish
1 Replies

8. UNIX for Dummies Questions & Answers

Grep and cat combined

Hello, i need to search one word (snp1) from many files and copy the content of the columns of this word in new file. example: file 1: SNP BP CHR P snp1 1 3 0.01 snp2 2 2 0.05 . . file 2: SNP BP CHR P snp1 1 3 0.06 snp2 2 2 0.3 output... (6 Replies)
Discussion started by: biopsy
6 Replies

9. Shell Programming and Scripting

Replace cat and grep with <

Hello someone told me to use OS=`awk '{print int($3)}' < /etc/redhat-release` instead of OS=cat /etc/redhat-release | `awk '{print int($3)}'` any idea for the reason ? (5 Replies)
Discussion started by: nimafire
5 Replies

10. UNIX for Dummies Questions & Answers

Grep or cat The Whole Directory PROBLEMS :(

Hi Guys This is my first post so I am not sure how things go here. I'm sorry if I'm breaking the rule or something. Feel free to correct me about that :) So as I was saying... I'd been trying to grep this folder containing 900,000 txt files but seems no luck. I get either "No such file... (6 Replies)
Discussion started by: Nexeu
6 Replies

LEARN ABOUT DEBIAN

dnstracer

DNSTRACER(8)						      General Commands Manual						      DNSTRACER(8)

NAME

       dnstracer - trace a chain of DNS servers to the source

SYNOPSIS

       dnstracer [options] name

DESCRIPTION

       dnstracer determines where a given Domain Name Server (DNS) gets its information from, and follows the chain of DNS servers back to the
       servers which know the data.

       Options are:

       -c      Disable local caching.

       -C      Enable negative caching.

       -o      Enable overview of received answers at the end.

       -q queryclass
	       Change the query-class, default is A. You can either specify a number of the type (if you're brave) or one of the following
	       strings: a, aaaa, a6, soa, cname, hinfo, mx, ns, txt and ptr.

       -r retries
	       Number of retries for DNS requests, default 3.

       -s server
	       DNS server to use for the initial request, default is acquired from the system. If a dot is specified (.), A.ROOT-SERVERS.NET will
	       be used.

       -v      Be verbose on what sent or received.

       -4      Use only IPv4 servers, don't query IPv6 servers (only available when IPv6 support hasn't been disabled)

       -S sourceaddress
	       Use this as source-address for the outgoing packets.

HOW IT WORKS

       It sends the specified name-server a non-recursive request for the name.

       Non-recursive means: if the name-server knows it, it will return the data requested. If the name-server doesn't know it, it will return
       pointers to name-servers that are authoritive for the domain part in the name or it will return the addresses of the root name-servers.

       If the name server does returns an authoritative answer for the name, the next server is queried. If it returns an non-authoritative answer
       for the name, the name servers in the authority records will be queried.

       The program stops if all name-servers are queried.

       Make sure the server you're querying doesn't do forwarding towards other servers, as dnstracer is not able to detect this for you.

       It detects so called lame servers, which are name-servers which has been told to have information about a certain domain, but don't have
       this information.

EXAMPLES

       Search for the A record of www.mavetju.org on your local nameserver:

       dnstracer www.mavetju.org

       Search for the MX record of mavetju.org on the root-nameservers:

       dnstracer "-s" . "-q" mx mavetju.org

       Search for the PTR record (hostname) of 212.204.230.141:

       dnstracer "-q" ptr 141.230.204.212.in-addr.arpa

       And for IPv6 addresses:

       dnstracer "-q" ptr "-s" . "-o" 2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.6.4.0.2.0.0.0.0.8.b.0.e.f.f.3.ip6.int

SEE ALSO

       ntptrace(8), traceroute(8), dig(1)

AUTHOR

       Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org)

       See http://www.mavetju.org/contacts.php for mailing-lists.

February 10, 2008						 February 10, 2008						      DNSTRACER(8)
All times are GMT -4. The time now is 11:45 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy