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The Way to Go

Copying Files

This lesson provides an implementation of copying files in Go.

We'll cover the following...

How do you copy a file to another file? The simplest way is using Copy from the io package:

Go (1.6.2)
package main
import (
"fmt"
"io"
"os"
)
func main() {
  CopyFile("output/target.txt", "source.txt")
  fmt.Println("Copy done!")
}
func CopyFile(dstName, srcName string) (written int64, err error) {
  src, err := os.Open(srcName)
  if err != nil {
    return
  }
  defer src.Close()
  dst, err := os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE, 0644)
  if err != nil {
    return
  }
  defer dst.Close()
  return io.Copy(dst, src)
}

In the code above, we isolate the copying of the file in a function CopyFile, which takes as parameters first the destination file, and secondly the source file. (see line 9 ...