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 $NAMEgrep $USERNAME awk {'print $7,$8'}`
if [ "$USER" != "" ]
then
echo $USER ——- $NAME
fi
done