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Suppose to feed the filter standard input with these line:
line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 9 line 10 It would be nicer if someone tell me how to write a script that prints only every 4 lines, in the case of the example input above:
line 1 line 5 line 9
That is, your answer is ‘
awk 'NR % 4 == 1'‘.