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Top Forums Shell Programming and Scripting Grep couple of consecutive lines if each lines contains certain string Post 302648609 by black_fender on Wednesday 30th of May 2012 07:01:34 AM
Old 05-30-2012
Grep couple of consecutive lines if each lines contains certain string

Hello,

I want to extract from a file like :
Code:
20120530025502914 | REQUEST | whatever
20120530025502968 | RESPONSE | whatever
20120530025502985 | RESPONSE | whatever
20120530025502996 | REQUEST | whatever
20120530025503013 | REQUEST | whatever
20120530025503045 | RESPONSE | whatever

I want to extract all groups of 2 lines in which the first line contanis 'REQUEST' and the next line below contains 'RESPONSE'

Basically from the above file I would like to have extracted the following :
Code:
20120530025502914 | REQUEST | whatever
20120530025502968 | RESPONSE | whatever
20120530025503013 | REQUEST | whatever
20120530025503045 | RESPONSE | whatever

(Please note those numbers from the first fields to be able to identify which line I've extracted from the initial file - basically the lines in red from the initial file ).
I'm not completely emty-handed, I have this snippet as a starting point ('stolen' a while ago from internet :P ) :
Code:
nawk 'c-->0;$0~s{if(b)for(c=b+1;c>1;c--)print r[(NR-c+1)%b];print;c=a}b{r[NR%b]=$0}' b=0 a=1 s="string" file

Which takes the line I that contains the "string" (in my case "REQUEST" ) and the next line after, but i don;t know where to put the condition that the line after to contain the string "RESPONSE" and if so to extract the respective group of 2 lines.

Last edited by Franklin52; 05-30-2012 at 08:03 AM.. Reason: Please use code tags for data and code samples
 

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fmt(1)								   User Commands							    fmt(1)

NAME
fmt - simple text formatters SYNOPSIS
fmt [-cs] [-w width | -width] [inputfile]... DESCRIPTION
fmt is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the -w width option. The default width is 72. fmt concatenates the inputfiles listed as arguments. If none are given, fmt formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. fmt does not fill nor split lines beginning with a `.' (dot), for compatibility with nroff(1). Nor does it fill or split a set of contiguous non-blank lines which is determined to be a mail header, the first line of which must begin with "From". Indentation is preserved in the output, and input lines with differing indentation are not joined (unless -c is used). fmt can also be used as an in-line text filter for vi(1). The vi command: !}fmt reformats the text between the cursor location and the end of the paragraph. OPTIONS
-c Crown margin mode. Preserve the indentation of the first two lines within a paragraph, and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. -s Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such for- matted text, from being unduly combined. -w width | -width Fill output lines to up to width columns. OPERANDS
inputfile Input file. ENVIRONMENT VARIABLES
See environ(5) for a description of the LC_CTYPE environment variable that affects the execution of fmt. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
nroff(1), vi(1), attributes(5), environ(5) NOTES
The -width option is acceptable for BSD compatibility, but it may go away in future releases. SunOS 5.11 9 May 1997 fmt(1)
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