help in shell

hello guys
I'm new with shell l wrote this script to see if I can run it to find hello guys to use a ypcat comand to list a gruop of memebers and the passwrod file and I can arrange the output as a following
5 : fac
6 : office
6 : mkl
18 : system
20 : xsystems
21 : guest

#! /bin/sh
echo "This script to show who log in."
HOST="fast" # Configure hostname
ypcat group
ypcat passwd

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