hostname dialog input box

#--------------{ Hostname Setup }----------------#
#configure_hostname(){
#read -p "Hostname [ex: tuxhatlinux]: " host_name
#echo "$host_name" > /mnt/etc/hostname
#}
configure_hostname(){
DIALOGRC=${DIALOGRC}
DISTNAME='Tux Hat Linux '
DISTVER='v3.4'
DASH='-'
SCRIPTNAME='Setup Hostname'

CONFIGFILE=/home/gary/Test/setup-tuxhat.conf
if [[ -f $CONFIGFILE ]]; then
  source $CONFIGFILE
else
  echo "Error missing file: setup-tuxhat.conf - Required by program"
  exit 1
fi

### Program for making the UI

DIALOG=${DIALOG=dialog}
#DIALOG=${DIALOG=Xdialog}

# Temp files

tmpfile=`tmpfile 2> /dev/null` || tmpfile=/tmp/tmpfile$$
trap "rm  -f $tmpfile" 0 1 2 5 15

DIALOGRC="$DIALOGRC" $DIALOG --backtitle "$DISTNAME$DISTVER $DASH $SCRIPTNAME " --no-shadow \
--inputbox "Please enter new Hostname [ex: tuxhatlinux]" 8 48 0> $tmpfile

retval=$?

case $retval in
0)
`cat $tmpfile` > /mnt/etc/hostname
;;
esac

}