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Grep a pattern and print following n lines

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Operating Systems AIX Grep a pattern and print following n lines
# 8  
Old 02-06-2015
Perhaps something like:
Code:
/usr/xpg4/bin/awk '
function pprev(		i) {
	for(i = (NR > LINES) ? NR - LINES + 1 : 1; i <= NR; i++) 
		print l[i % LINES]
	print ""
}
{	l[NR % LINES] = $0
}
$0 ~ PAT {
	pprev()
}' LINES=3 PAT='9' file

If file contains 100 lines numbered from 100 to 001:
Code:
100
099
098
098
...
003
002
001

the output produced is:
Code:
100
099

100
099
098

099
098
097

098
097
096

097
096
095

096
095
094

095
094
093

094
093
092

093
092
091

092
091
090

091
090
089

081
080
079

071
070
069

061
060
059

051
050
049

041
040
039

031
030
029

021
020
019

011
010
009

This User Gave Thanks to Don Cragun For This Post:
ssk250
# 9  
Old 02-06-2015
The following shell command emulates the ggrep -E -A4, and works on all Unix:
Code:
PATH=/usr/xpg4/bin:/bin:/usr/bin awk '$0~PAT {a=A+1} (a && a--)' A=4 PAT="ISEND" sqloutput1.log

Omit the A=x to have the normal grep -E behavior.
This User Gave Thanks to MadeInGermany For This Post:
ssk250
# 10  
Old 02-06-2015
Hi.

Some general alternatives, as opposed to single-purpose solutions:
Code:
Print lines above, below pattern-matched line (context, window); "only" string matching pattern
	1) GNU grep -A -B; ggrep on some Solaris

	2) peg, a perl script, does not use "-o" like GNU grep;
	allows -A, -B

	3) ack, a perl script, can use "-o" like GNU grep; allows -A,
	-B

	4) cgrep does not use "-o" like GNU grep; allows -nline,
	+nline for context like GNU grep -A, -B

	5) bool, prints context in bytes

	6) xtcgrep, extension of CPAN grep; allow -C context; allows -o;
	complicated calling sequence; http://freecode.com/projects/greppm

Best wishes ... cheers, drl
This User Gave Thanks to drl For This Post:
ssk250
# 11  
Old 02-06-2015
The probably easiest way is to use good old sed instead of all the fancy tools:

Code:
sed -n '/<search-pattern>/ {;N;...N;p;}' /path/to/file

Put in x-1 "N"s to display x lines of text after the matched pattern.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
ssk250
# 12  
Old 02-07-2015
Quote:
Originally Posted by drl
Hi.

Some general alternatives, as opposed to single-purpose solutions:
Code:
Print lines above, below pattern-matched line (context, window); "only" string matching pattern
    1) GNU grep -A -B; ggrep on some Solaris

    2) peg, a perl script, does not use "-o" like GNU grep;
    allows -A, -B

    3) ack, a perl script, can use "-o" like GNU grep; allows -A,
    -B

    4) cgrep does not use "-o" like GNU grep; allows -nline,
    +nline for context like GNU grep -A, -B

    5) bool, prints context in bytes

    6) xtcgrep, extension of CPAN grep; allow -C context; allows -o;
    complicated calling sequence; http://freecode.com/projects/greppm

Best wishes ... cheers, drl


Thanks ... ggrep is working on Solaris.
# 13  
Old 02-07-2015
Problem solved. But the previous sed solution needs a fix; (at least on Solaris) it does not print at the end of a file, because the N command terminates the script. Therefore, each N is to be preceded by a $p.
The following works with a number for the trailing lines (here: 3).
Code:
sed -e '/^<search-pattern>/!d;:L' -e '$p;N;s/\n/&/3;t' -e 'bL' file

---------- Post updated at 10:19 AM ---------- Previous update was at 10:14 AM ----------

Hmm interesting, GNU sed prints at the end of the file, so the $p would print twice...
Which sed is correct?
This User Gave Thanks to MadeInGermany For This Post:
bakunin
# 14  
Old 02-09-2015
Quote:
Originally Posted by MadeInGermany
But the previous sed solution needs a fix; [...]
Hmm interesting, GNU sed prints at the end of the file, so the $p would print twice...
You objection is correct and it was my bad not to think my solution through to the end. GNU-sed - as it is so often is the case - gets it wrong (again).

bakunin
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