type = filetype["colon-separated"] {
    :recordseparator => "\n"
    :fieldseparator => "\n"
    :fields = %{name password uid gid ....}
    :namefield = "name"
}

passwd = filetype["colon-separated"].new("/etc/passwd")
shadow = filetype["colon-separated"].new("/etc/shadow")

user = jointype {
    passwd => "name"
    shadow => "name"
}

passwd = type["/etc/passwd"]


user.new()


passwd["yaytest"] = {
    :uid => 100
    ...
}