Drush 4 supported a number of "deprecated" aliases; these command forms were supported in Drush 3, but printed a warning message advising that the preferred command name should be used instead. In Drush 5, these aliases are entirely removed.
The removed aliases include:
'script' => 'php-script'
'sync' => 'core-rsync'
'installsite' => 'site-install'
'is' => 'site-install'
'wd' => 'watchdog-delete'
'enable' => 'pm-enable'
'disable' => 'pm-disable'
'uninstall' => 'pm-uninstall'
'sm' => 'pm-list'
'refresh' => 'pm-refresh'
'updatecode' => 'pm-updatecode'
'update' => 'pm-update'
'download' => 'pm-download'
Drush 5 now contains a "shell aliases" feature; users who wish to continue to use the command names removed in Drush 5 can easily do so by defining appropriate shell aliases in their drushrc.php files. The example Drush configuration file, examples/example.drushrc.php, contains example shell aliases for all of these removed command names.
