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How to Use scutil on macOS for Network Configuration and Troubleshooting

The scutil command is a powerful utility in macOS used for managing and troubleshooting network configuration and system configuration parameters. It is particularly useful for advanced users and system administrators who need to interact with the System Configuration framework. This article will guide you through the basics of using scutil, its importance, and practical examples to help you leverage its capabilities for network management and troubleshooting on macOS.

Examples:

  1. Viewing Current Network Configuration: To view the current network configuration, you can use the --nc option with scutil:

    scutil --nc status

    This command will display the status of all network services, including VPN connections.

  2. Setting Hostname: You can set the system hostname using scutil with the following command:

    sudo scutil --set HostName my-new-hostname

    Replace my-new-hostname with your desired hostname. This command requires superuser privileges, hence the sudo.

  3. Checking Network Reachability: To check if a specific host is reachable, you can use the --get option with scutil:

    scutil --get HostName

    This will return the current hostname of the system.

  4. Monitoring Network Changes: You can monitor network changes in real-time using scutil:

    scutil --dns

    This command will display the DNS configuration and will update in real-time as changes occur.

  5. Interactive Mode: scutil also has an interactive mode that allows you to query and set various configuration parameters:

    scutil

    Once in interactive mode, you can use commands like open, show, set, and commit to manage configuration settings. For example:

    > open
    > show State:/Network/Global/IPv4

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