[Users] Command line password update?

[Tom Horsley]

I'm getting tired of running around to all the programs that
remember the password I'm forced to change every 3 months
and changing them individually.

One of the programs I have to change is a claws-mail
SMTP password for one account.

Is there a command line option I can use to change a
saved password so I could write a script to automate
the change?

Or is there some standard crypto tool I can use to
generate the string that I see stored in the
accountrc file?