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I have below file: main.txt

/F/FID/FID/000001/0/20180215//1/2/
/F/FID/FID/000002/0/20180215//1/2/
/F/FID/FID/000003/0/20180215//1/2/
/F/FID/FID/000004/0/20180215//1/2/
/F/FID/FID/000005/0/20180215//1/2/
/F/FID/FID/000006/0/20180215//1/2/

I like to use sed to print every two rows into a new file:

file1.txt

/F/FID/FID/000001/0/20180215//1/2/
/F/FID/FID/000002/0/20180215//1/2/

file2.txt

/F/FID/FID/000003/0/20180215//1/2/
/F/FID/FID/000004/0/20180215//1/2/

file3.txt

/F/FID/FID/000005/0/20180215//1/2/
/F/FID/FID/000006/0/20180215//1/2/
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  • split command is better suited here.. see man split for details.. if you try that and still have some doubts, you can update the question..
    – Sundeep
    Feb 28, 2018 at 5:02

1 Answer 1

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Not easy with sed, but

awk 'NR%2 {fname = sprintf("file%d.txt", ++n)} {print > fname}' main.txt

giving 

head file*.txt
==> file1.txt <==
/F/FID/FID/000001/0/20180215//1/2/
/F/FID/FID/000002/0/20180215//1/2/

==> file2.txt <==
/F/FID/FID/000003/0/20180215//1/2/
/F/FID/FID/000004/0/20180215//1/2/

==> file3.txt <==
/F/FID/FID/000005/0/20180215//1/2/
/F/FID/FID/000006/0/20180215//1/2/

Alternatively,

split --lines=2 --numeric-suffixes=1 --suffix-length=1 --additional-suffix='.txt' main.txt 'file'

(some of these options may be specific to the GNU version of split).

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