How to print linux group names on multiple line instead of single line output

Question

I have tried getent, group command, id -Gn $user and some sed combination but I don't think I am able to achieve hence reaching out to fellow programmers.
I want to be able to print this : groups abc123
Output abc123 : devops build test design

Expected Output
groups:
- devops
- build
- test
- design

Answer 1

using bash:

for i in `groups`; do echo $i; done

using tr:

groups | tr \  \\n