If you hit TAB after 'master@{1}..mas' and 'mas' is unique, then it is expanded to 'mastermaster@{1}..master'. If 'mas' is not unique, and you continue hitting TAB, then the part before '@' is doubled with each TAB.
-- Hannes
threads / discuss / 14572
Subject: bash completion: master@{1}..mas<TAB> gives mastermaster@{1}..master
If you hit TAB after 'master@{1}..mas' and 'mas' is unique, then it is expanded to 'mastermaster@{1}..master'. If 'mas' is not unique, and you continue hitting TAB, then the part before '@' is doubled with each TAB.
-- Hannes