Search for a pattern in a file and print previous lines from a particular point Post: 302301788

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Top Forums Shell Programming and Scripting Search for a pattern in a file and print previous lines from a particular point Post 302301788 by umaislearning on Saturday 28th of March 2009 10:20:42 AM

03-28-2009

Registered User

Quote:

Originally Posted by Ikon

Something like this??

Code:

root@jeepanywhere /usr/src # cat test.log
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
root@jeepanywhere /usr/src # sed -n '/^2/,/^4/{/LABEL$/!p}' test.log
2
3
4
2
3
4
2
3
4

I am not able to understand this command very clearly, but this is wat I want, please tell me if that sed command will give me the below output:

suppose I have a file like the one below:

start of file-----
***********
1
2
3
4
5
========
***********
6
7
8
9
========
end of file-----
Now for eg I need to search for 8, then search for the first occurance of the pattern ***** thats jus few lines(no. of lines not fixed) above 8...then from there I need to print till end of file....
so my output needs to be something like this:
***********
6
7
8
9
============
end of file-----

Thanks in advance...

umaislearning

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LEARN ABOUT DEBIAN

qstail

QSTAIL(1)							  qstail man page							 QSTAIL(1)

NAME

       qstail - Utility prints the end of a log file starting at the specified pattern.

SYNOPSIS

       qstail -i <path> -p <pattern>

DESCRIPTION

       qstail  shows  the end of a log file beginning with the line containing the specified pattern. This may be used to show all lines which has
       been written after a certain event (e.g., server restart) or time stamp.

OPTIONS

       -i <path>
	      Input file to read the data from.

       -p <pattern>
	      Search pattern (literal string).

SEE ALSO

       qsexec(1), qsfilter2(1), qsgeo(1), qsgrep(1), qslog(1), qslogger(1), qspng(1), qsrotate(1), qssign(1)

AUTHOR

       Pascal Buchbinder, http://opensource.adnovum.ch/mod_qos/

mod_qos utilities 10.8						     June 2012								 QSTAIL(1)