How to merge text file vertically? [duplicate]

Question

Let's assume that I've got two text file a, b.

$cat a
a a
a a
a a

$cat b
b b
b b
b b

Then, I want to merge these two file vertically by using paste. The merged file is shown bellow

a a
a a
a a
b b
b b
b b

NOT

$paste a b > AB
$cat AB
a a b b
a a b b
a a b b

"The merged file will be b" should be changed "The merged file will be below". I don't know how to modify. — comphys
– comphys, Commented Jan 17, 2017 at 9:57
You mean something like cat a.txt b.txt? To edit your question just press edit under your question — George Vasiliou
– George Vasiliou, Commented Jan 17, 2017 at 9:59

Sergiy Kolodyazhnyy · Accepted Answer · 2017-01-17 10:00:47Z

6

Just cat a.txt b.txt > out.txt. If you want even spaces and no blank lines

$ awk 'NF' inputA.txt inputB.txt                           
a a
a a
a a
b b
b b
b b

answered Jan 17, 2017 at 10:00

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