#!/bin/bash
#set -x
progname=`basename $0`

usage () { echo -e "Usage:\n\t$progname first_name \nor\n\t$progname first_name group_name\n" ; exit 1 ; }

[ $# -gt 2 ] && usage 
[ $# -lt 1 ] && usage 

first_name=$1

if [ $# -eq 2 ] ; then
    group_name=$2
    group_id=`ypmatch $group_name group | cut -d':' -f3`
    [ "$group_id" ] || { echo "$group_name: no such group" ; exit 2 ; }
#    echo "$group_name" "$group_id"
    ypcat passwd | grep "^[^:]*:[^:]*:[^:]*:$group_id:$first_name " |\
	cut -d':' -f1,5 | tr ':' '\t'
else
    ypcat passwd | grep "^[^:]*:[^:]*:[^:]*:[^:]*:$first_name " |\
	cut -d':' -f1,5 | tr ':' '\t'
fi