Help with selecting specific lines in a large file

tansha · #1 (**permalink**) 02-05-2008

Hello,

I need to select the 3 lines above as well as below a search string, including the search string.

I have been trying various combinations using sed command without any success.

Can anuone help please.

Thanking

fpmurphy · #2 (**permalink**) 02-05-2008

If you can use grep instead of sed the grep options -A -B or -C should allow you to do what you want to do.

tansha · #3 (**permalink**) 02-06-2008

Hello, Thanks for the reply.

But I don't think I can use grep as I don't know what are the data block in between teh search string.
My file layout is as follows:

------------------------------
Data
(numerous lines)
------------------------------
Data
(numerous lines)
------------------------------
Data
(numerous lines)
------------------------------
Data
(numerous lines)

And so on. I only need to get the 3 lines above and below the -----------
as well as the -------------

Thanks for any assistance

.

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