List all users for each group with members command

allmembers.sh

#!/bin/bash

# Version: 	0.1
# Description: 	This script has a dependancy with members package
# Tested only on Ubuntu
# 
# todo: 
# - test members package existance with which output
# - get rid of members dependancy

if [ -x /usr/bin/members ]; then
  for GROUP_NAME in `groups`
  do
    echo "Group: $GROUP_NAME"
    echo "Users found: `members $GROUP_NAME`"
  done 
else
  echo "/usr/bin/members not found"
  echo "please install members package with: sudo apt-get install members"
fi