Question

I would like to split a line into words. I know this can be done with this

For word in $line; do echo $word; done  

But I want to make group of 3-3 words. So my question is, how can I split a line in group of 3-3 words ?

For example

Input : I am writing this line for testing the code.  

Output :  
I am writing
this line for
testing the code.  

Answer 1

As a start you can use this, which reads every word into an array

#!/bin/bash

total=0
while read
do
    for word in $REPLY
    do
        A[$total]=$word
        total=$(($total+1))
    done
done < input.txt

for i in "${A[@]}"
do
    echo $i
done

Next step is to use seq or similar to loop through the array and print it in groups of three.