Dialog-based password changer script

passwd.sh

#!/bin/bash
## This script made to change your password with TUI dialog
## Original script made by NixCraft
## https://bash.cyberciti.biz/guide/A_password_box
# password storage
if [[ "$EUID" -ne 0 ]]; then
    old=$(tempfile 2>/dev/null)
fi
new=$(tempfile 2>/dev/null)

# trap it
if [[ "$EUID" -ne 0 ]]; then
    trap "rm -f $old" 0 1 2 5 15
fi

trap "rm -f $new" 0 1 2 5 15

# get password with the --insecure option
if [[ "$EUID" -ne 0 ]]; then
    dialog --title "Password" \
           --insecure \
           --passwordbox "Enter your current password" 8 50 2> $old
fi
dialog --title "Password" \
       --insecure \
       --passwordbox "Enter your new password" 8 50 2> $new

ret=$?

# make decison
case $ret in
  0)
    if [[ "$EUID" -ne 0 ]]; then
        echo -e "$(cat $old)\n$(cat $new)\n$(cat $new)" | passwd $1 2> /dev/null
    else
        echo -e "$(cat $new)\n$(cat $new)" | passwd $1 2> /dev/null
    fi
    ;;
  1)
    echo "Cancel pressed.";;
  255)
    [ -s $data ] &&  cat $data || echo "ESC pressed.";;
esac