passwd -l foobar      <--  to lock the account named foobar
      passwd  foobar        <--  to unlock the account by issuing a new pass.

   There was a bug that's just been solved with a TA and a PTF that
   fixes the problem where you could not create an account and force
   the user to change their password at the next login.  We were faced
   with a locked account instead of being faced with a logged in user
   looking at the password change screen.  Thanks SCO!

<mschalit@pacbell.net>
gerberb@zenez.com