Applies any available updates and prompts any logged-in user to restart.

Install All System Updates.sh

#!/bin/bash

# Modify these strings to change the verbiage in the badge notification.
title="Updates Applied"
description="macOS updates have been applied to your device. Please restart to complete the process."
acceptText="Restart"
closeText="Later"

if (( $(softwareupdate -l 2>&1 | grep -c '   *') > 0 )); then
    softwareupdate -ia

    username=$(/usr/bin/python -c 'from SystemConfiguration import SCDynamicStoreCopyConsoleUser; import sys; username = (SCDynamicStoreCopyConsoleUser(None, None, None) or [None])[0]; username = [username,""][username in [u"loginwindow", None, u""]]; sys.stdout.write(username + "\n");')
    if [[ "$username" == "" ]]; then
        echo "No one logged in. Let's restart after updating"
        (sleep 5 && reboot) &> /dev/null &
        exit 0
    elif /Library/Addigy/macmanage/MacManage.app/Contents/MacOS/MacManage action=notify title="${title}" description="${description}" closeLabel="${closeText}" acceptLabel="${acceptText}"; then
        echo "User:$username accepted restart."
        sudo -u "$username" osascript -e 'tell app "loginwindow" to «event aevtrrst»'
        exit 0
    else
        echo "User:$username delayed restart."
        exit 0
    fi
else
    echo "No available updates for this device."
    exit 0
fi

Lots of people have asked me for help with automatically updating macOS devices and prompting the restart. I don't recommend this model, so don't blame me if this breaks things.

1. Check for updates.
2. Apply updates.
3. If no one's logged in, then restart.
4. Otherwise, prompt any logged in user to restart. And pray.