Modify macos DNS info using scutil

as sudo user

sh-3.2# scutil
> list
  subKey [0] = Plugin:IPConfiguration
  subKey [1] = Plugin:InterfaceNamer
  subKey [2] = Plugin:KernelEventMonitor
  subKey [3] = Setup:
  subKey [4] = Setup:/
  subKey [5] = Setup:/Network/Global/IPv4
  subKey [6] = Setup:/Network/HostNames
  subKey [7] = Setup:/Network/Interface/en0/AirPort
  subKey [8] = Setup:/Network/Service/57751377-898B-4D7B-BD0E-7A44118D0BA8
  subKey [9] = Setup:/Network/Service/57751377-898B-4D7B-BD0E-7A44118D0BA8/IPv4
  subKey [10] = Setup:/Network/Service/57751377-898B-4D7B-BD0E-7A44118D0BA8/IPv6
  subKey [11] = Setup:/Network/Service/57751377-898B-4D7B-BD0E-7A44118D0BA8/Interface
  subKey [12] = Setup:/Network/Service/57751377-898B-4D7B-BD0E-7A44118D0BA8/Proxies
  subKey [13] = Setup:/Network/Service/6DC9BC56-8EE1-4DB8-AA58-613589FC89AC
  subKey [14] = Setup:/Network/Service/6DC9BC56-8EE1-4DB8-AA58-613589FC89AC/IPv4
  subKey [15] = Setup:/Network/Service/6DC9BC56-8EE1-4DB8-AA58-613589FC89AC/IPv6
  subKey [16] = Setup:/Network/Service/6DC9BC56-8EE1-4DB8-AA58-613589FC89AC/Interface
  subKey [17] = Setup:/Network/Service/6DC9BC56-8EE1-4DB8-AA58-613589FC89AC/Proxies
  subKey [18] = Setup:/Network/Service/B4E88888-36D9-4747-A9AF-620F6A3AA8CD
  subKey [19] = Setup:/Network/Service/B4E88888-36D9-4747-A9AF-620F6A3AA8CD/DNS
  subKey [20] = Setup:/Network/Service/B4E88888-36D9-4747-A9AF-620F6A3AA8CD/IPv4
  subKey [21] = Setup:/Network/Service/B4E88888-36D9-4747-A9AF-620F6A3AA8CD/IPv6
  subKey [22] = Setup:/Network/Service/B4E88888-36D9-4747-A9AF-620F6A3AA8CD/Interface

  <snip>

> show State:/Network/Global/DNS
<dictionary> {
  SearchDomains : <array> {
    0 : olympus.f5net.com
    1 : f5net.com
    2 : hsd1.ca.comcast.net
  }
  SearchOrder : 101402
  ServerAddresses : <array> {
    0 : 192.168.76.180
    1 : 192.168.76.181
  }
  __CONFIGURATION_ID__ : Supplemental: F5NetworksServicePPP 2
  __FLAGS__ : 16390
  __ORDER__ : 2
}

> list State:/Network/Service/.*/DNS
  subKey [0] = State:/Network/Service/B4E88888-36D9-4747-A9AF-620F6A3AA8CD/DNS
  subKey [1] = State:/Network/Service/F5NetworksServicePPP/DNS
  
> get State:/Network/Service/F5NetworksServicePPP/DNS
> d.add ServerAddresses * 75.75.75.75 75.75.76.76
> d.show
<dictionary> {
  ServerAddresses : <array> {
    0 : 75.75.75.75
    1 : 75.75.76.76
  }
  SupplementalMatchDomains : <array> {
    0 : f5net.com
    1 :
  }
}
> set State:/Network/Service/F5NetworksServicePPP/DNS
>