In my server's root folder I have the folder
www that contains sites of all my websites. All of these are Drupal.
Navigating into each folder and doing
drush --no-backup up -y each time, can be both time consuming and tiring.
Is there a way to update all sites at once, with drush, instead of installing third-party software (like Ansible, IINW).
drush --no-backup up -y @sites won't help in this case, as it is aimed for multisites, and I don't work with multisites at all.
Update 1 - Note (might not be relevant when you read this question):
<?php $aliases['mine'] = array( 'site-list' => array('@site1', '@site2') );
The file containing it should be putted under public_html (or www) with permissions as 755 or 644.