從一個文件拷貝到另一個文件 ~~~ package main import ( "fmt" "io" "os" ) func CopyFile(dstName, srcName string) (writeen int64, err error) { src, err := os.Open(dstName) if err != nil { fmt.Println(err) return } defer src.Close() dst, err := os.OpenFile(srcName, os.O_CREATE|os.O_WRONLY, 0644) if err != nil { fmt.Println(err) return } defer dst.Close() return io.Copy(dst, src) } func main() { CopyFile("/tmp/test", "/tmp/test_copy1") fmt.Println("copy done.") } ~~~