Amberfish supports right truncated queries such as the following:
$ af -s -d mydb -q 'car*'
The query term, `car*', finds all documents containing the word, `car', `cars', or `carpet', or any other word that starts with the prefix, `car'. A term such as `s*' will match any word that starts with the letter, `s', and it may take a while for Amberfish to process; not to mention the fact that it is very likely to match every document in the database.