Bash中Case语句传递参数：实现指定服务启停的方法

Got it, let's fix this up for you! The core issue here is that your current start case branch isn't passing the extra command-line arguments (like users) to your start_services function. Since you already built the function to handle specific services, we just need to forward those parameters along.

Modified Case Statement #

Update your case block to pass all arguments after the first one to the corresponding function:

case "$1" in
    (-h)
        display_help
        exit 0
        ;;
    (start)
        # Pass all arguments starting from the 2nd one to start_services
        start_services "${@:2}"
        ;;
    (stop)
        # Optional: Do the same if stop_services needs to handle specific services
        stop_services "${@:2}"
        ;;
    (*)
        display_help
        exit 0
        ;;
esac

What's happening here? #

• ${@:2} is a shell parameter expansion that grabs all positional arguments starting from the 2nd one.
  • When you run ./services.sh start users, this passes users to start_services.
  • When you run ./services.sh start, ${@:2} is empty, so your function will fall back to its "start all services" logic exactly as you want.

Quick Check for Your Function #

Just to confirm, your start_services function should be using $@ to access the passed service names, like this example:

start_services() {
    if [ $# -eq 0 ]; then
        echo "Starting all services..."
        # Logic to start every service
    else
        for service in "$@"; do
            echo "Starting service: $service..."
            # Logic to start the specific service
        done
    fi
}

This setup will work seamlessly for both your "start all" and "start specific service" use cases.

内容的提问来源于stack exchange，提问作者jberthia