Set drush alias for current path Is it possible to associate a path with a specific drush alias?

Use case:

I'm on my local dev machine and I'm in /var/www/site1 when I run drush I want it to run as drush @site1 without me having to append @site1 every time.

My alias files are all stored in the my local home directory.
If you store settings.php in the default folder, then Drush will already behave as you desire.  If settings.php is in some other folder (e.g. 'site1'), see the site-set command (drush help site-set)