awk display the match and 2 lines after the match is found.


 
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# 1  
Old 02-02-2012
awk display the match and 2 lines after the match is found.

Hello, can someone help me how to find a word and 2 lines after it and then send the output to another file.
For example, here is myfile1.txt. I want to search for "Error" and 2 lines below it and send it to myfile2.txt
I tried with grep -A but it's not supported on my system.
I tried with awk, but I am not getting the first line displayed.

Here is myfile1.txt


**My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 123 terminated
**ID PIN 12345
Comamnd Successful
Command Terminated
Command Successful
Command Terminated
**My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 345 terminated
**ID PIN 67890
Comamnd Successful
Command Terminated
Command Successful
Command Terminated
**My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 678 terminated
**ID PIN 13579
Comamnd Successful
Command Terminated
Command Successful
Command Terminated


After I ran awk 'c-->3;/Error/{c=5}' myfile1.txt > myfile2.txt i get this

**Port 123 terminated
**ID PIN 12345
**Port 345 terminated
**ID PIN 67890
**Port 678 terminated
**ID PIN 13579

I want these lines to be displayed, but I want the line with the error in it, too.

so myfile2.txt should look like this:


**My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 123 terminated
**ID PIN 12345
**My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 345 terminated
**ID PIN 67890
**My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 678 terminated
**ID PIN 13579

What am I doing wrong?

Thank you
# 2  
Old 02-02-2012
Try sed:
Code:
sed -n '/My Program Error/{N;N;p}' myfile1.txt

# 3  
Old 02-03-2012
Please use code tags when posting i/output or code.
Your awk command is almost correct, you were really close, just add print:
Code:
awk 'c-->3;/Error/{c=5; print}'

Or, with getline and no variable:
Code:
awk '/Error/{print; getline; print; getline; print}'

Or, with getline reading into a variable instead of $0:
Code:
awk '/Error/{getline a; getline b; print $0,a,b }' OFS="\n" err.log

If the match is on the very end of file, solution 2 will print duplicates, and solution 3 will print empty lines. To treat this, you could check for the return value of getline.

Last edited by mirni; 02-03-2012 at 05:26 AM.. Reason: eof treatment
# 4  
Old 02-03-2012
Quote:
Originally Posted by balajesuri
Try sed:
Code:
sed -n '/My Program Error/{N;N;p}' myfile1.txt

Cool! Tried it and this one works as what he wanted.
Would you mind explaining the command a little?
I can only assume N is new line.
# 5  
Old 02-03-2012
The codes 1 and 2 are what I was looking for. Is there a way to add a blank line after the third line.

---------- Post updated at 06:16 PM ---------- Previous update was at 03:12 PM ----------

Never mind, I was able to figure it out.
awk '/Error/{print; getline; print; getline; print; print ""}' did the trick insertinbg ablank line.
 
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