Grep specific lines

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# 1  
Old 03-24-2014
Grep specific lines


I have a file with nearly 90000 lines in x,y,z format but have some lines that I do not need to show. Is there anyway to delete those 3 lines after every 288 lines.
Eg I keep the first 288 lines delete (289, 290 291); keep the next 288 lines after those and so on...

# 2  
Old 03-24-2014
I think you can use the head and tail commands to achieve what you want.
This User Gave Thanks to blackrageous For This Post:
# 3  
Old 03-24-2014
Not very familiar with head and tail. Do I have to set line 1 as head and line 288 as tail?
# 4  
Old 03-24-2014
Or maybe awk.
# 5  
Old 03-24-2014
awk '!((NR-1)%m),!((NR-p)%m)' m=291 p=288 file

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# 6  
Old 03-24-2014
Thank you for the insight it does help with what I was looking for....
Is it possible to use the same logic in awk to insert after a given number of lines?
# 7  
Old 03-24-2014
You are welcome. No I think you would need something else for that. It is best to create a new thread for that question..
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