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Full Discussion: Grep line above X condition
Homework and Emergencies Homework & Coursework Questions Grep line above X condition Post 302416971 by EAGL€ on Wednesday 28th of April 2010 07:08:52 AM
Old 04-28-2010
its no that easy to achive your requirement, but i can partially help you.

first of all to find Nth occurance of a pattern in a file use this one liner (N=4):

Code:
nawk -F\: -v occ="4" '$NF~/pattern/{i++} i==occ{print $0;exit}' infile

and to be able to get 1 line before (1 line above!) and 0 line after a pattern:

Code:
/usr/sfw/bin/ggrep "pattern" -A0 -B1 infile

using the above knowlende you can try to create a script for your aim.

regards
 

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LEARN ABOUT LINUX

zegrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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