well it looks like there is still no usermod command in leopard and they have gotten rid of the god awful netinfo manager.
the new commands use dscl (directory services client) for managing users and groups. its still a bit confusing and less straight forward than the normal unix commands , usermod, groupadd, etc.
list groups
dscl . -list /groups
read group
dscl . -list /groups/_www
add users
dscl . -merge /groups/_www users pjkix
