Splitting file based on quantity of lines, each part save to one file AWK, BASH

Question

Good day to all,

I was wondering how to split a file based on the quantity of number lines, this number passed as variable and each part has the same size (same line numbers), and each part save it into a file.

This is what I have tried:

awk -v var="$1" ' FNR==var {close("Partfile"f);f++}{print $0 > "Partfile"f}' datafile

Thanks in advance for any clue

possible duplicate of [Unix: How to split a file into equal parts, without breaking individual lines?](http://stackoverflow.com/questions/7764755/unix-how-to-split-a-file-into-equal-parts-without-breaking-individual-lines) — tripleee, Aug 06 '14 at 17:44
mmm... nope, I don't care about the integrity of the line and I request on awk, not on split — Another.Chemist, Aug 06 '14 at 17:46
Post some sample input and expected output as your question is open to interpretation in several different ways. And make the input the difficult cases to handle, not the easy ones. — Ed Morton, Aug 06 '14 at 17:54

score 5 · Accepted Answer · answered Aug 06 '14 at 17:21

5

Use split

split -l 20 file Partfile

to split in lumps of 20 lines each.

answered Aug 06 '14 at 17:21

Mark Setchell

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Referee! Red Card! :-) @triplee in the very first comment told Alejandro his question is a dup of one with a `split` solution and Alejandro argued that he wanted an `awk` solution, not a `split` one, and then he accepted the answer using `split`! – Ed Morton Aug 06 '14 at 21:03
@EdMorton Some OPs, eh? – Mark Setchell Aug 06 '14 at 21:05
I'll tell yah... ;-). – Ed Morton Aug 06 '14 at 21:42

score 1 · Answer 2 · answered Aug 06 '14 at 17:28

1

With awk:

awk -v var="$1" '(FNR % var) == 1 { ++n; close(f); f = "Partfile" n } { print > f }' datafile

answered Aug 06 '14 at 17:28

konsolebox

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Thanks, please, can you explain me this part: `(FNR % var) == 1` – Another.Chemist Aug 06 '14 at 17:31
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@Alejandro For every start of the set, `FNR % var` would always be 1. See a discussion about modulus: http://mathforum.org/library/drmath/view/54363.html – konsolebox Aug 06 '14 at 17:36

Splitting file based on quantity of lines, each part save to one file AWK, BASH

2 Answers2