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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 DEBIAN

logtop

LOGTOP(1)						      General Commands Manual							 LOGTOP(1)

NAME

       logtop - Realtime log line rate analyser

SYNOPSIS

       logtop [OPTIONS]

DESCRIPTION

	logtop is a System Administrator tool analyzing line rate on stdin.
	It reads on stdin and print a constantly updated result
	displaying, in columns:
	Line number, count, frequency, and the actual line.

	 $ tail -f FILE | logtop
	is the friendly version of:
	 $ watch 'tail FILE | sort | uniq -c | sort -gr'

OPTIONS

       -s, --size=K
	      Only keep K lines in memory, instead of 10000.

       -q, --quiet
	      Do not display a live view of the data, only display a top at exit.

       -l, --line-by-line=K
	      Print result line by line, in a machine friendly format, K is the number of result to print per line.

		Line by line format is : [%d %f %s	]*

		  %d : Number of occurences
		  %f : Frequency of apparition
		  %s : String (Control chars replaced by dots.

       -i, --interval=K
	      Interval between graphical updates, in seconds. Defaults to 1.

       -h, --help
	      Show summary of options.

       -v, --version
	      Show version of program.

EXAMPLES

       Here are some logtop usage examples.

       tail -f cache.log | grep -o "HIT|MISS" | logtop

       Realtime hit / miss ratio on some caching software log file.

       tail -f access.log | cut -d' ' -f1 | logtop -s 10000

       Realtime most querying IPs on your server, as long as log lines in access.log starts with the client IP.

       tail -f access.log | cut -d' ' -f7 | logtop -s 10000

       Realtime most requested web pages in a NCSA like log file.

       cat auth.log | grep -v "CRON" | grep -o ": .*" | logtop -q -s 100000

       Display a one-shot simple analyse of your auth.log.

SEE ALSO

       watch(1)

AUTHOR

       logtop was written by Julien Palard.

       This manual page was written by Julien Palard <julien@palard.fr>, for the Debian project (and may be used by others).

								  April 16, 2011							 LOGTOP(1)
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