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Full Discussion: awk one liner
Top Forums UNIX for Dummies Questions & Answers awk one liner Post 302383798 by vidyadhar85 on Thursday 31st of December 2009 01:35:05 PM
Old 12-31-2009
here b is no of line before pattern and a is no of lines after pattern and s is pattern..
Code:
awk '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=3 a=5 s="pattern" filename

 

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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)
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