How to modify hosts in go language

The method for modifying hosts in Go language is: 1. Create a Go sample file; 2. Import the required packages and obtain function methods; 3. Open the hosts file through the "os.OpenFile()" method; 4. , create a writer, and add or modify the hosts information; 5. Write the hosts information into the file, refresh the buffer and synchronize the file contents to the disk.

Operating system for this tutorial: Windows 10 system, Go1.20.1 version, Dell G3 computer.

Go language can modify the hosts file through the OpenFile() function in the os package and the Writer in the bufio package.

The following is an implementation method:

package main
import (
"bufio"
"os"
)
func main() {
// 打开hosts文件，文件不存在则新建一个
file, err := os.OpenFile("/etc/hosts", os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
panic(err)
}
defer file.Close()
// 创建writer写入器
writer := bufio.NewWriter(file)
// 需要添加或者修改的hosts信息
hosts := "127.0.0.1    example.com"
// 写入hosts信息到文件中
_, err = writer.WriteString(hosts + "\n")
if err != nil {
panic(err)
}
// 刷新缓冲区并将文件内容同步到磁盘中
err = writer.Flush()
if err != nil {
panic(err)
}
}

The above code will write 127.0.0.1 example.com into the hosts file. If the file does not exist, a new one will be created.

It should be noted that in UNIX systems, the hosts file is usually located in /etc/hosts, while in Windows systems, the hosts file is usually located in C:\Windows\System32\drivers\etc\hosts. Therefore, you need to check the hosts file path of the current operating system when using it.

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