Command lines to update Drupal

update_drupal_commands

# ensure you have backed up the database and files before running these commands
# mysql/mariadb
drush sql-dump --gipz --result-file

#postgres
pg_dump -U postgres -h localhost "[YOUR_DATABASE]" | gzip > [dbname]-[date]00.sql.gz

# remove old files
rm -rf images/ includes/ misc/ modules/ profiles/ scripts/ themes/
rm -f .* *.php *.txt *.config

# update with new files
cp -Rf drupal-7.52/* [website root]/
cp -f drupal-7.52/.* [website root]/

# restore backed up files eg
cp ~/backup/.gitignore [website root]/

drush updb
drush updb #yes twice