saslpasswd2+flat file

[Yadavenedra Awasthi <yadu@xxxxxxxxxxxxxxxxxxxxx>]

If I am having a flat file of 30-40 thousand username and password, so 
is there a way i can convert whole file at once in sasldb format. I mean 
can file be hashed at once instead of running saslpasswd2 test@xxxxxxxx 
test everytime through a script as it can be highly  resource intensive 
if it is running every 15 minutes as cron job.

Regards.
Yadavendra.