easy setting of variable GUI shell script

#!/bin/bash
####################################
#
# START
# g0ne_@p0stal <v1ral_ITS>
# ImPerialTeKSolutions@outlook.com
#
####################################
echo "          #              #      "
echo "          ################    ####"
echo "          ################    ####"
echo "          ################     ##"
echo "                         #"
echo "             #################"
echo "          ####################"
echo "          ####################"
echo "          ##             #"
echo "          ##"
echo "            #"
echo "          ####      ## "
echo "          ####    ###### "
echo "          ##     ######## "
echo "          #     ####     #"
echo "          #     ####     #"
echo "          #     ####    ##"
echo "          #    ####    ## "
echo "           ########   ####"
echo "            #####"
echo " v1ral_ITS"
echo " https://pastebin.com/u/v1ral_ITS"
echo " ImPerialTeKSolutions@outlook.com"
sleep 0

# Start Script
# Dimensions
height=50
width=60
outfile=$0.output

# Start
echo -n "VARIABLE=" > $outfile
gdialog --title "Displaying, $0" --inputbox "Enter variable, please:" $height $width 2>> $outfile

# Retrieve and display variable
. $outfile
echo "The variable in the \"input box\" was: "$VARIABLE""

# Clean
rm $outfile

exit $?