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To view disabled services, if any:

sudo launchctl print-disabled system

To disable UUCP, run the following command:

sudo launchctl disable system/com.apple.uucp

To disable Telnet, run the following command:

sudo launchctl disable system/com.apple.telnetd

To disable the Apple File (AFP) Sharing service, run the following command:

sudo launchctl disable system/com.apple.AppleFileServer

To disable FTP, run the following command:

sudo launchctl disable system/com.apple.ftpd

To disable RSH, run the following command:

sudo launchctl disable system/com.apple.rshd

To disable SMB, run the following command:

sudo launchctl disable system/com.apple.smbd

To disable tftp, run the following command:

sudo launchctl disable system/com.apple.tftpd

To disable the Bonjour service, run the following commands:

sudo launchctl disable system/com.apple.mDNSResponder
sudo launchctl disable system/com.apple.mDNSResponderHelper

To view disabled services again:

sudo launchctl print-disabled system

disabled services = {
    "com.apple.AppleFileServer" => true
    "com.apple.CSCSupportd" => true
    "com.apple.uucp" => true
    "com.apple.mDNSResponderHelper" => true
    "com.apple.ftpd" => true
    "com.apple.mdmclient.daemon.runatboot" => true
    "com.apple.rshd" => true
    "com.apple.smbd" => true
    "com.apple.tftpd" => true
    "com.apple.telnetd" => true
    "com.apple.mDNSResponder" => true
}

Reboot and then rerun the above command to verify the services are still disabled.

View Networking Services

sudo /usr/sbin/networksetup -listallnetworkservices

To disable unwanted Networking Services:

sudo /usr/sbin/networksetup -setnetworkserviceenabled 'Bluetooth PAN' off
sudo /usr/sbin/networksetup -setnetworkserviceenabled 'USB ACM' off
sudo /usr/sbin/networksetup -setnetworkserviceenabled 'Thunderbolt Bridge' off
sudo /usr/sbin/networksetup -setnetworkserviceenabled 'Wi-Fi' off

yawnbox