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Shell Programming and Scripting

Print every nth line

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# 1  
Old 05-02-2012
Print every nth line
Dear all,

How to print every nth line. File like this:

Code:
File input:
1
1
1
1
1
1
2
2
2
3
3
3
3
3
3
4
4
4

Desire output:

Code:
1
1
2
3
3
4

For this example, I must print 3rd, 6th, 9th, 12th, 15th, 18th line (every 3 line).

Thanks for advance.

Attila
# 2  
Old 05-02-2012
Try this:
Code:
awk 'NR % 3 == 0'  input-file >output-file



Should print as you want.
This User Gave Thanks to agama For This Post:
attila
# 3  
Old 05-02-2012
Code:
 
cat filename.txt | xargs -n3 | awk '{print $NF}'

# 4  
Old 05-02-2012
Thank agama, it work
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