[otrs] How can I reset passwords for all customers?

Hi, I need to perform a mass reset of all customer passwords, for security reasons (hundreds of accounts). Is there a shell script I can call to reset the password for each customer account? Can it be done directly from the database, without using Perl / OTRS framework? Thanks, Bogdan P.S:I thought this was the purpose of the otrs.SetPassword.pl script but it seems it only works for agent accounts.