On a wiki where I know are some archived files:
$ php deleteArchivedFiles.php --delete
Searching for and deleting archived files...
PHP Notice: Uninitialized string offset: 0 in /home/jqadmin/jqdocs_repo_stage/www/mediawiki-core/includes/filerepo/FileRepo.php on line 1326
PHP Notice: Uninitialized string offset: 1 in /home/jqadmin/jqdocs_repo_stage/www/mediawiki-core/includes/filerepo/FileRepo.php on line 1326
PHP Notice: Uninitialized string offset: 2 in /home/jqadmin/jqdocs_repo_stage/www/mediawiki-core/includes/filerepo/FileRepo.php on line 1326
Notice - file '' not found in group 'deleted'
...etc..etc..etc..
Done! [0 file(s)]
Version: 1.21.x
Severity: normal