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Full Discussion: Grep word after last occurance of string and display next few lines
Top Forums Shell Programming and Scripting Grep word after last occurance of string and display next few lines Post 302879441 by Don Cragun on Thursday 12th of December 2013 01:08:01 PM
Old 12-12-2013
Quote:
Originally Posted by MadeInGermany
In your first post you wanted a "before" line (that my awk script stored in the b variable) and 2 "after" lines.
Without "before" line and 3 "after" lines:
Code:
awk 'cnt&&cnt-- {s=s RS $0} /ERROR|WARNING/ {if (cnt==0) s=s (s?RS:s) $0; cnt=3} /Starting/ {s=""; cnt=0} END {print s}' errorlog

Actually, after throwing away everything in the sample input before the last line containing "Starting", the command:
Code:
grep -E -A3 -in 'WARNING|ERROR'

(the original command line nes provided [except it was missing the -E]) on the remaining text would produce:
Code:
3:WARNING
4-line8.8
5-line8.9
6-line9
7:ERROR
8-line10
9-line11

and accept ERROR and WARNING in mixed case (not just in all caps). You and I could duplicate this in awk, but it is complex enough that I didn't want to take the time to reinvent what grep already does so well. I thought we just needed to extract the final lines from errlog and feed them into the grep command nes had already supplied.
 

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LEARN ABOUT SUSE

look

LOOK(1) 						    BSD General Commands Manual 						   LOOK(1)

NAME

     look -- display lines beginning with a given string

SYNOPSIS

     look [-dfa] [-t termchar] string [file]

DESCRIPTION

     The look utility displays any lines in file which contain string as a prefix.  As look performs a binary search, the lines in file must be
     sorted (where sort(1) got the same options -d and/or -f that look is invoked with).

     If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic char-
     acters is ignored.

     Options:

     -d      Dictionary character set and order, i.e. only alphanumeric characters are compared. (On by default if no file specified).

     -f      Ignore the case of alphabetic characters. (On by default if no file specified).

     -a      Use the alternate dictionary /usr/share/dict/web2

     -t      Specify a string termination character, i.e. only the characters in string up to and including the first occurrence of termchar are
	     compared.

     The look utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred.

FILES

     /usr/share/dict/words  the dictionary
     /usr/share/dict/web2   the alternate dictionary

SEE ALSO

     grep(1), sort(1)

COMPATIBILITY

     The original manual page stated that tabs and blank characters participated in comparisons when the -d option was specified.  This was incor-
     rect and the current man page matches the historic implementation.

HISTORY

     Look appeared in Version 7 AT&T Unix.

AVAILABILITY

     The look command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

BSD
								   June 14, 1993							       BSD
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