generating random passwords ... for a csv file with user details

[k.i.n.g.]

Hi,

I have a csv file which in taken as the input file for adding users in
my linux mail server with the format

userid,fullname,passwword,dateofbith

Now I have to write a script to generate random password in the
password field for each user. A simple algorithm is sufficient for
passwords

I being new to scripting would seek all your help in doing so

Thanks In advance

kanthi