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Drupdate is a very simple BASH script which downloads and unpacks a chosen Drupal release. It speeds up the process of updating Drupal core a bit.
You still need to run the
update.php script on your own, though.
And you need shell access to be able to run drupdate.
drupdate [VERSION] [DIRECTORY]
Both arguments are optional. If you omit them, the script will run as a wizard.