Q:

Golang program to create a copy of the existing file

belongs to collection: Golang File Handling Programs

YasminRadwan26
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2022-07-04
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In this program, we will create a copy of the existing file with the same content using io.Copy() function.

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YasminRadwan26
2022-07-04
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Program/Source Code:

The source code to create a copy of the existing file is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Golang program to create a copy of the
// existing file

package main

import "os"
import "io"
import "fmt"

func main() {
	existingFile, err := os.Open("Sample.txt")

	if err != nil {
		fmt.Println("Unable to open file")
	}

	CopyFile, err := os.Create("Copy.txt")
	if err != nil {
		fmt.Println("Unable to create file")
	}

	len, err := io.Copy(CopyFile, existingFile)
	if err != nil {
		fmt.Println("Unable to copy file")
	}
	fmt.Printf("%d bytes copied successfully", len)

	existingFile.Close()
	CopyFile.Close()
}

Output:

27 bytes copied successfully

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt, os packages then we can use a function related to the fmt and os package.

In the main() function, we opened an existing file "Sample.txt" and then create a new file "Copy.txt"  and copy the content of "Sample.txt" into "Copy.txt". After that, print the total number of bytes copied into the "Copy.txt" file.

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