Search a User By name & get his ID on Unix

#! /usr/bin/sh

echo "Enter User Name to be Searched"
read USERNAME


NAMES=`who | awk {'print $1'} | sort -u`

for NAME in $NAMES
do
USER=`finger $NAME|grep $USERNAME| awk {'print $7,$8'}`
if [ "$USER" != "" ]
then
echo $USER ------- $NAME
fi
done