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This question already has an answer here:

Suppose I've a file named "a.txt" and it has 100 lines. Now I want to extract odd lines i.e lines 1,3,5...etc and save them to a different file such as Odd.txt and the same thing for all even lines to save them in the even.txt file keeping the source file as it is.

marked as duplicate by don_crissti, Stephen Kitt, Jeff Schaller, PersianGulf, user34720 Jun 6 '16 at 18:13

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You can use awk:

awk '{ print > (NR % 2 ? "odd.txt" : "even.txt") }' a.txt

This reads from a.txt and appends lines to either odd.txt or even.txt depending on the current line number.

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With sed:

sed -ne 'w odd.txt' -e 'n; w even.txt' a.txt

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