Nested for loop in bash

Question

Hello I would like to ask you, how can I write the same exact loop in bash

for (int i = 0; i < a; i++) {
    for (int j = i; j < a; j++) {
        System.out.println(i + " " + j);
    }
}

actually i tried for a in b yet.. i was not successful and i am a big beginner in bash — JavaFreak, Jun 23, 2016 at 23:20
is this related to unix.stackexchange.com/questions/291624/… ? — Archemar, Jun 24, 2016 at 6:31
No sir, it is not related, i was actually trying to come up with two different versions — JavaFreak, Jun 24, 2016 at 19:09

Mikel · Accepted Answer · 2016-06-24 19:57:40Z

5

bash supports C-style for loops as follows:

a=5 # example

for ((i = 0; i < a; i++)); do
  for ((j = i; j < a; j++)); do
    echo "$i $j"
  done
done

Mikel

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answered Jun 24, 2016 at 1:20

leekaiinthesky

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