Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

different emulations of...

different emulations of...

different emulations of...


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...

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' '
$0~p{n=FNR;for(i=B;i>=0;--i)if(n-i>0)print x[(n-i)%(B+1)]
}' /path/to/input 

Hope This Helps, PH.
FAQ219-2884: How Do I Get Great Answers To my Tek-Tips Questions?
FAQ181-2886: How can I maximize my chances of getting an answer?

RE: different emulations of...


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!


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close