A for each loop in bash would do it.
Something like:
Code:
for each in `zmprov gaa domain.com`; do zmprov sp $each password; done
That would set all the passwords to "password".
It would take a while to do that, though, at 100 users.
You may just want to output that into a text file and pipe the text file into zmprov so you don't call zmprov 100 times.