scutil

Manage system configuration parameters

/var/run/resolve.conf is not used by max os 

    scutil
    scutil --prefs [preference-file]
    scutil -r [-W] { nodename | address | local-address remote-address }
    scutil -w dynamic-store-key [-t timeout]
    scutil --get pref
    scutil --set pref [newval]
    scutil --dns
    scutil --proxy
    scutil --nc nc-arguments
    scutil --renew interface-name
Retain hostname:(Sequoia 15.2 )
sudo scutil --set ComputerName YourComputerName
sudo scutil --set HostName YourComputerName
sudo scutil --set LocalHostName YourComputerName

With no options provides a command line interface to the "dynamic store" data maintained by configd.

--pref [file] interactive access to "raw" preference data.

-r [-W] [-t secs] Checks the network reachability of a host, an IP address, or a pair of local and remote IP addresses. Network "reachability" indicates whether network communication is possible between the current host and the specified host.
With -W, watches for change.
With -w key waits for the creation or posting of a notification to the dynamic store .
With -t timeout in seconds.

--get
--set 		report
update a group of preferences.

--dns current DNS configuration.
The first resolver configuration is the default as well as those without a domain name.
Those containing a "domain" name will be used for queries matching.
--proxy Current proxy

--nc VPN connections. --nc help
See System Settings/ network /other services
list 
scutil --nc list
Available network connection services in the current set (*=enabled):
* (Disconnected)   9E918907-9C9E-4100-87C9-70A755670C57 PPP --> J-Link "J-Link 2" [PPP:Modem]   segger evalboard
* (Disconnected)   0E4D729F-D515-4EEA-9F5D-F53899796051 PPP --> J-Link "J-Link"   [PPP:Modem]
status service 
scutil --nc status J-Link
Disconnected
Extended Status  {
  PPP :  {
    DeviceLastCause : 0
    LastCause : 0
    Status : 0
  }
  Status : 0
}
show service Display configuration
statistics service bytes, packets, and errors
select service Activate
start service [--user user]
[--password password] [--secret secret]
stop service Stop
suspend service PPP, Modem on Hold)
resume service PPP, Modem on Hold)
ondemand [W] [hostname]
ondemand -- --refresh
trigger hostname [background] [port]
enablevpn service | type [path] Pass a path to set ApplicationURL
disablevpn service | type
--renew triggers a re-evaluation of the network configuration on the interface.

OPTIONS

-r [-W] { nodename | address | local-address remote-address } Check the network reachability of the specified host name, IP address, or a pair of local and remote IP addresses.
Reachable can be reached using the current network configuration.
Transient Connection can be reached via a transient (e.g. PPP) connection.
Connection Required a connection must first be established. As an example, a dialup connection that was not currently active but could handle network traffic for the target system.
Connection Automatic a connection must first be established.
traffic directed to the specified name/address will initiate the connection.
Local Address a network interface on this system.
Directly Reachable Addresss Network traffic is routed directly i.e. not through a gateway
Not Reachable cannot be reached using the current network configuration.
The reachability can also be monitored by specifying the -W (watch) option. This will result in the current status being reported as well as the status when/if the network configuration changes.

A zero exit status will be returned when the reachability status is reported correctly. A non-zero exit status will be returned if errors are detected with an error reported to standard error.

-w dynamic-store-key
[-t timeout]		 if the key exists in the "dynamic store" maintained by configd returns 0 .
Waits for the data to be associated or a notification to be posted.
A non-zero exit status if the key was not created/posted within the specified time.
Waits indefinitely if a timeout of 0. A very bad idea.
The default timeout is 15 seconds.
--get {ComputerName |
       LocalHostName|
       HostName 
% scutil --get ComputerName
smac14
% scutil --get LocalHostName
smac14
% scutil --get HostName
--set {ComputerName |
       LocalHostName|
       HostName [newval]		 If newval is not specified on the command line it will be read from standard input.
--dns Reports DNS configuration.
--proxy Reports proxy configuration.
--nc nc-arguments commands for monitoring and interacting with VPN connections.
Use --nc help for a list of commands.
--renew interface-name Triggers a re-evaluation of the network configuration on the interface.

Help

reformetted 
 help                         : list available commands
 f.read file                  : process commands from file

 d.init                       : initialize (empty) dictionary
 d.show                       
       dictionary> {
       }

 d.add key [*#?%] val [v2,… ] (*=array, #=number, ?=boolean, %=hex data)
 d.remove key                 

 list [pattern]               : list keys in data store
 add key ["temporary"]        : add key in data store w/current dict
 get key                      : get dict from data store w/key
 set key                      : set key in data store w/current dict
 show key ["pattern"]         : show values in data store w/key
 remove key                   : remove key from data store
 notify key                   : notify key in data store

notification keys:
 n.list ["pattern"]           : list 
 n.add key ["pattern"]        : add 
 n.remove key ["pattern"]     : remove 

 n.changes                    : list changed keys
 n.watch                      : watch for changes
 n.cancel                     : cancel notification requests
 quit
reformatted 
 11/24/24
 % scutil --dns
DNS configuration

resolver #1
 search domain[0] : germans.com
 nameserver[0] : 192.168.1.1
 if_index : 14 (en0)                 flags   : Request A records   : 00020002 (Reachable, Directly Reachable Address)
            domain              options  timeout   flags                reach           order
resolver #2 : local         : mdns          : 5 : Request A records : 0(Not Reachable) : 300000
resolver #3 : 254.169.in-addr.arpa : mdns   : 5 : Request A records : 0(Not Reachable) : 300200
resolver #4 : 8.e.f.ip6.arpa : mdns         : 5 : Request A records : 0(Not Reachable) : 300400
resolver #5 : 9.e.f.ip6.arpa : mdns         : 5 : Request A records : 0(Not Reachable) : 300600
resolver #6 : a.e.f.ip6.arpa : mdns         : 5 : Request A records : 0(Not Reachable) : 300800
resolver #7 : b.e.f.ip6.arpa : mdns         : 5 : Request A records : 0(Not Reachable) : 301000

DNS configuration (for scoped queries)

resolver #1
 search domain[0] : germans.com
 nameserver[0] : 192.168.1.1
 if_index : 14 (en0)            flags   : Scoped, Request A records : 00020002 ( Reachable, Directly Reachable Address)
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/ uuid 
subKey   [9] = Setup:/Network/Service/uudi/IPv4
subKey  [10] = Setup:/Network/Service/uudi/IPv6
subKey  [11] = Setup:/Network/Service/uudi/Interface
subKey  [12] = Setup:/Network/Service/uudi/Proxies
subKey  [13] = Setup:/Network/Service/uudi
subKey  [14] = Setup:/Network/Service/uudi/IPv4
subKey  [15] = Setup:/Network/Service/uudi/IPv6
subKey  [16] = Setup:/Network/Service/uudi/Interface
subKey  [17] = Setup:/Network/Service/uudi/Proxies
subKey  [18] = Setup:/Network/Service/uudi
subKey  [19] = Setup:/Network/Service/uudi/IPv4
subKey  [20] = Setup:/Network/Service/uudi/IPv6
subKey  [21] = Setup:/Network/Service/uudi/Interface
subKey  [22] = Setup:/Network/Service/uudi/Proxies
subKey  [23] = Setup:/Network/Service/uudi
subKey  [24] = Setup:/Network/Service/uudi/IPv4
subKey  [25] = Setup:/Network/Service/uudi/IPv6
subKey  [26] = Setup:/Network/Service/uudi/Interface
subKey  [27] = Setup:/Network/Service/uudi/Proxies
subKey  [28] = Setup:/Network/Service/uudi
subKey  [29] = Setup:/Network/Service/uudi/IPv4
subKey  [30] = Setup:/Network/Service/uudi/IPv6
subKey  [31] = Setup:/Network/Service/uudi/Interface
subKey  [32] = Setup:/Network/Service/uudi/Proxies
subKey  [33] = Setup:/Network/Service/uudi
subKey  [34] = Setup:/Network/Service/uudi/IPv4
subKey  [35] = Setup:/Network/Service/uudi/IPv6
subKey  [36] = Setup:/Network/Service/uudi/Interface
subKey  [37] = Setup:/Network/Service/uudi/Proxies

subKey  [38] = Setup:/System

subKey  [39] = State:/IOKit/LowBatteryWarning
subKey  [40] = State:/IOKit/PowerManagement/CurrentSettings
subKey  [41] = State:/IOKit/PowerManagement/SystemLoad
subKey  [42] = State:/IOKit/PowerManagement/SystemLoad/Detailed

subKey  [43] = State:/Network/Global/DNS
subKey  [44] = State:/Network/Global/IPv4
subKey  [45] = State:/Network/Global/Proxies
subKey  [46] = State:/Network/Global/SMB

subKey  [47] = State:/Network/Interface
subKey  [48] = State:/Network/Interface/anpi0/Link
subKey  [49] = State:/Network/Interface/anpi0/LinkQuality
subKey  [50] = State:/Network/Interface/anpi1/Link
subKey  [51] = State:/Network/Interface/anpi1/LinkQuality
subKey  [52] = State:/Network/Interface/anpi2/Link
subKey  [53] = State:/Network/Interface/anpi2/LinkQuality
subKey  [54] = State:/Network/Interface/ap1/AirPort
subKey  [55] = State:/Network/Interface/ap1/Link
subKey  [56] = State:/Network/Interface/ap1/LinkQuality
subKey  [57] = State:/Network/Interface/awdl0/AirPort
subKey  [58] = State:/Network/Interface/awdl0/IPv6
subKey  [59] = State:/Network/Interface/awdl0/Link
subKey  [60] = State:/Network/Interface/awdl0/LinkQuality
subKey  [61] = State:/Network/Interface/bridge0/Link
subKey  [62] = State:/Network/Interface/en0/AirPort
subKey  [63] = State:/Network/Interface/en0/CaptiveNetwork
subKey  [64] = State:/Network/Interface/en0/IPv4
subKey  [65] = State:/Network/Interface/en0/IPv6
subKey  [66] = State:/Network/Interface/en0/Link
subKey  [67] = State:/Network/Interface/en0/LinkQuality
subKey  [68] = State:/Network/Interface/en1/Link
subKey  [69] = State:/Network/Interface/en1/LinkQuality
subKey  [70] = State:/Network/Interface/en2/Link
subKey  [71] = State:/Network/Interface/en2/LinkQuality
subKey  [72] = State:/Network/Interface/en3/Link
subKey  [73] = State:/Network/Interface/en3/LinkQuality
subKey  [74] = State:/Network/Interface/en4/Link
subKey  [75] = State:/Network/Interface/en4/LinkQuality
subKey  [76] = State:/Network/Interface/en5/Link
subKey  [77] = State:/Network/Interface/en5/LinkQuality
subKey  [78] = State:/Network/Interface/en6/Link
subKey  [79] = State:/Network/Interface/en6/LinkQuality
subKey  [80] = State:/Network/Interface/llw0/IPv6
subKey  [81] = State:/Network/Interface/lo0/IPv4
subKey  [82] = State:/Network/Interface/lo0/IPv6
subKey  [83] = State:/Network/Interface/lo0/LinkQuality
subKey  [84] = State:/Network/Interface/utun0/IPv6
subKey  [85] = State:/Network/Interface/utun1/IPv6
subKey  [86] = State:/Network/Interface/utun2/IPv6
subKey  [87] = State:/Network/Interface/utun3/IPv6

subKey  [88] = State:/Network/MulticastDNS
subKey  [89] = State:/Network/NetBIOS
subKey  [90] = State:/Network/PrivateDNS

subKey  [91] =    State:/Network/Service/ uuid 
subKey  [92] = State:/Network/Service/ uuid /IPv6
subKey  [93] = State:/Network/Service/ uuid 
subKey  [94] = State:/Network/Service/ uuid /IPv6
subKey  [95] = State:/Network/Service/ uuid /DHCP
subKey  [96] = State:/Network/Service/ uuid /DNS
subKey  [97] = State:/Network/Service/ uuid /IPv4
subKey  [98] = State:/Network/Service/ uuid /SMB
subKey  [99] = State:/Network/Service/ uuid 
subKey [100] = State:/Network/Service/ uuid /IPv6
subKey [101] = State:/Network/Service/ uuid 
subKey [102] = State:/Network/Service/ uuid /IPv6

subKey [103] = State:/Network/mDNSResponder/DebugState
subKey [104] = State:/Users/ConsoleUser

subKey [105] = com.apple.DirectoryService.
                NotifyTypeStandard:DirectoryNodeAdded
subKey [106] = com.apple.MobileBluetooth
subKey [107] = com.apple.opendirectoryd.node:/Contacts
subKey [108] = com.apple.opendirectoryd.node:/Search
subKey [109] = com.apple.sharing
subKey [110] = com.apple.sharing:/AutoUnlock/Enabled
subKey [111] = com.apple.sharing:/AutoUnlock/InProgress
subKey [112] = com.apple.smb

SEE ALSO

configd(8) list of