How to use Go language to implement a shutdown function

Go language (also known as Golang) is a statically strongly typed, compiled language developed by Google. It is simple and efficient and is widely used in network servers, cloud computing, big data and other fields. In this article, we will introduce how to use Go language to implement a shutdown function.

Implementing shutdown
Before describing how to use Go language to implement shutdown, we need to understand some basic knowledge, such as how to execute system commands. Go language provides the os package to implement the function of executing system commands. The following is a sample program:

package main

import (
    "os"
    "os/exec"
    "fmt"
)

func main() {
    cmd := exec.Command("ls")
    cmd.Stdout = os.Stdout
    cmd.Run()
}

In this sample program, we execute the ls command by creating an exec.Cmd object and redirect the standard output to os.Stdout. Finally, we call the Run method to execute the command.

Next, we can use this knowledge to implement the shutdown function. In Windows systems, we can use the "shutdown" command to shutdown. The following is the sample code:

package main

import (
    "os/exec"
    "fmt"
)

func main() {
    cmd := exec.Command("shutdown", "-s", "-t", "0")
    err := cmd.Run()
    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println("Shutdown command executed successfully.")
    }
}

In this sample program, we execute the Windows "shutdown" command by creating an exec.Cmd object and passing the "-s" and "-t 0" parameters. Among them, "-s" means shutdown, and "-t 0" means shutdown immediately. Finally, we call the Run method to execute the command. If an error occurs during execution, we will output an error message; otherwise, we will output a prompt message.

Note: In Linux systems, the shutdown command is not "shutdown", but "poweroff".

Summary
Through the introduction of this article, we have learned how to use Go language to implement the shutdown function. Using the exec.Cmd object in the os package, we can easily execute system commands. Of course, in practical applications, issues such as system permissions and user interaction also need to be considered. Hope this article is helpful to you.

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