How to Run Software Update via Terminal Screen

usage: softwareupdate <mode> [<args> ...]

        -l | --list             List all appropriate updates
        -d | --download         Download Only
        -i | --install          Install
                <label> ...       specific updates
                -a | --all              all appropriate updates
                -r | --recommended      only recommended updates

        Per-user preferences:
        --ignore <label> ...      Ignore specific updates
        --reset-ignored         Clear all ignored updates
        --schedule (on | off)   Set automatic checking

        -v | --verbose  Enable verbose output
        -h | --help     Print this help

 

You need to run the following command as root or sudo before you run the command:

softwareupdate --install --all
sudo softwareupdate --install --all

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