different emulations of... 3

[w5000]

gnu grep:

grep -A n -B m ...

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

thank you.

 

[PHV]

Provide WHAT ?

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[PHV]

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:

awk -vA=[i]n[/i] -vB=[i]m[/i] -vp=[i]'pattern'[/i] '
{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
FAQ181-2886

 

[w5000]

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

thank you.

 

[SamBones]

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

Kudos!