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different emulations of...

different emulations of...

(OP)

gnu grep:

grep -A n -B m ...

in awk, sed, perl... to be as shortest as possible anyone could please provide?

thank you.

RE: different emulations of...

3
Oh, I think I understand:
You don't have a gnu grep version and want to emulate its -A and -B options, right ?
A starting point:

CODE --> awk

awk -vA=n -vB=m -vp='pattern' '
{x[FNR%(B+1)]=$0}
$0~p{n=FNR;for(i=B;i>=0;--i)if(n-i>0)print x[(n-i)%(B+1)]
     for(i=0;i<A;++i){getline;print}
}' /path/to/input 

Hope This Helps, PH.
FAQ219-2884: How Do I Get Great Answers To my Tek-Tips Questions?
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RE: different emulations of...

(OP)

right, I don't have GNU grep on a system.

thank you.

RE: different emulations of...

Wow! Another star for PHV for pulling the question out of an obscure and ambiguous post, AND providing a great response!

Kudos!

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