php artisan key:generate --force - still NOT write to .env

I'm create a script to start my Laravel 5.8 project

#Install dependencies
composer self-update
composer install

# create .env base on .env.example
cat .env.example > .env

#permission
chmod -R 777 .env

#create the key
php artisan key:generate --force

cat .env

#set permission
chmod -R 777 bootstrap/ vendor/ storage/ public/

sleep 1

#clear cache
php artisan config:cache
php artisan cache:clear
composer dump-autoload
php artisan clear-compiled

php artisan key:generate

python -mwebbrowser http://127.0.0.1:8000
php artisan serve

This line does not seem to work.

php artisan key:generate --force

Look at my .env

 ⚡️  bheng  cat .env                                                                             
APP_ENV=local                                                                                  
APP_URL=http://bheng.test/                                                                     
APP_DEBUG=true                                                                                 
APP_KEY=***                                                                                    
CODE=###                                                                                       

#---------------------------------------------- DATABASE                                       

DB_CONNECTION=mysql                                                                            
DB_HOST=4.2.2.1                                                                            
DB_DATABASE=b                                                                          
DB_USERNAME=dev                                                                                
DB_PASSWORD=123
DB_PORT=3306

#---------------------------------------------- EMAIL

MAIL_DRIVER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_FROM=8863b0c62fbcff
MAIL_PASSWORD=***

#----------------------------------------------

GOOGLE_WEB_API_KEY=***

Can someone please help me ?

from php artisan key:generate --force - still NOT write to .env