Looping over pairs of values in bash

Question

I have 10 text files and I want to paste each file with its pair, such that I have 5 total files.

I tried the following:

for i in 4_1 5_         


        

Answer 1

Simplest so far:

for i in "1 a" "2 b" "3 c"; do a=( $i ); echo ${a[1]}; echo ${a[0]}; done

a
1
b
2
c
3