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grep for a search string

 
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# 8  
Old 03-12-2008
Quote:
Originally Posted by raga
HI,
awk '/pattern/{c=11}c&&c--' file
this actually returned me all the 11 lines from the occurance of the pattern in the file.
But i didnt understand how it is working?can you please explain me.

Thank you.
First adjust it to work properly,
you mean 10 lines including the pattern?

Code:
awk '/pattern/{c=10}c&&c--' file

# 9  
Old 03-12-2008
yes.i adjusted for 10.but not understanding the command
{c=10}c &&c--
can you please explain me the above part,so that i can fine tune for any of my requirement.

Thanks for your help
# 10  
Old 03-12-2008
Set c to 10 when the current record matches the pattern,
then decrease c and print the records while c is greater than 0.
# 11  
Old 03-12-2008
Java
Quote:
Originally Posted by radoulov
Code:
awk '/pattern/{c=11}c&&c--' file

Great!Can you please explain how this command is working?
# 12  
Old 03-12-2008
Quote:
Originally Posted by DILEEP410
Great!Can you please explain how this command is working?
See my reply above.

May be this one from Ed Morton should be easier to understand:

Quote:
Set a counter to the number of lines you want to print
and decrement it once per line to zero, invoking the default
action of printing the current line as long as it's non-zero.
An example to make it clear:

Code:
$ cat file
line1
line2
line3
pattern
line1 OK
line2 OK
line3 OK
line4
line5
$ nawk 'c{print c--,$0}/pattern/{c=3}' file
3 line1 OK
2 line2 OK
1 line3 OK

 
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