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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
Old 03-28-2009
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...
 

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TAIL(1) 						      General Commands Manual							   TAIL(1)

NAME
tail - deliver the last part of a file SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ] tail [ -fr ] [ -n nlines ] [ -c ncharacters ] [ file ] DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied. Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or characters, according to the appended flag or Default is -10l (ten ell). The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears. The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed. EXAMPLES
tail file Print the last 10 lines of a file. tail +0f file Print a file, and continue to watch data accumulate as it grows. sed 10q file Print the first 10 lines of a file. SOURCE
/sys/src/cmd/tail.c BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length. According to custom, option +number counts lines from 1, and counts blocks and characters from 0. TAIL(1)
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