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Extract lines with specific words with addition 2 lines before and after

 
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# 1  
Old 07-02-2012
Extract lines with specific words with addition 2 lines before and after
Dear all,

Greetings.

I would like to ask for your help to extract lines with specific words in addition 2 lines before and after these lines by using awk or sed.

For example, the input file is:

Code:
1 ak1 abc1.0
1 ak2 abc1.0
1 ak3 abc1.0
1 ak4 abc1.0
1 ak5 abc1.1
1 ak6 abc1.1
1 ak7 abc1.1
1 ak8 abc1.1
1 ak9 abc1.1
1 ak10 abc1.1
1 ak11 abc1.2
1 ak12 abc1.2
1 ak13 abc1.2
1 ak14 abc1.2
1 ak15 abc1.2

How can I extract the lines as below:

Code:
1 ak3 abc1.0
1 ak4 abc1.0
1 ak5 abc1.1
1 ak6 abc1.1
1 ak7 abc1.1
1 ak8 abc1.1
1 ak9 abc1.1
1 ak10 abc1.1
1 ak11 abc1.2
1 ak12 abc1.2

I truly appreciate your advice and helps. Thank you very much in advance. Hoping to hear a reply from you.

Best regards,
Amanda

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data.
# 2  
Old 07-02-2012
What OS (type of UNIX)?
# 3  
Old 07-02-2012
Dear jim mcnamara,

Sorry... Is x86_64 GNU/Linux the answer for your question?

I am sorry if I did not answer the questions, I am new in this field.

Thank you very much.

Amanda
# 4  
Old 07-02-2012
@amanda, your expected output shows, just a paragraph printing .. If yes, try the below ..
Code:
$ nawk '/ak3/,/ak12/' infile
1 ak3 abc1.0
1 ak4 abc1.0
1 ak5 abc1.1
1 ak6 abc1.1
1 ak7 abc1.1
1 ak8 abc1.1
1 ak9 abc1.1
1 ak10 abc1.1
1 ak11 abc1.2
1 ak12 abc1.2
$

If question varies, post the expected output along with your tries to achieve ..
# 5  
Old 07-02-2012
Hi Jayan Jay,

Thank you very much for your reply.

Firstly I would like to apologize about my unclear example. Actually I have a big dataset which I need to extract lines with specific words from the 3rd column which is "abc1.1" from this example together with 2 lines above and 2 lines below. This pattern will loop for the whole dataset.

Is there any possibility?

Thank you very much in advance.

Best wishes,
Amanda
# 6  
Old 07-02-2012
Gnu grep has -C option

try this

Code:
grep -C 2 "abc1.1" input.txt

This User Gave Thanks to itkamaraj For This Post:
Amanda Low
# 7  
Old 07-02-2012
Hi Itkamaraj,

Thank you very much for your help. It works perfectly.

Thanks again.

Amanda
 
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