Install (or reinstall) Drupal

install-drupal.sh

#!/bin/bash
#
# Install (or reinstall) Drupal.

dir=/var/www/my-website/
files=sites/default/files/
default=sites/default/default.settings.php
settings=sites/default/settings.php
vendor=vendor/

cd $dir

sudo bash -c "
rm -rf $files $settings > /dev/null 2>&1
mkdir $files
cp $default $settings
chmod 775 $files $settings
chown root:www-data $files $settings
chown -R $USER:$USER $vendor
"

composer install
sudo chown -R root:www-data $vendor