Extract one line from every 3 lines

Shell Programming and Scripting
1

Hi,

I am trying with the below command to extract every line after 3 lines in a file.

Somehow I am failing to achieve it. Why?

awk '!($1%3)'
2

Like this?

$> cat infile
1
2
3
4
5
6
7
$> awk 'NR % 3 == 0' infile
3
6
3 
awk '!(NR%4)' infile

---------- Post updated at 06:50 AM ---------- Previous update was at 06:49 AM ----------

Use gawk, nawk or /usr/xpg4/bin/awk on Solaris.

4

Do you mean like this:

awk 'NR>3' infile
5

That could be the 4th line, the 8th line and so fort. Please clarify your question.