Free Chapter
Reading and writing files can be done in numerous ways. Go provides interfaces that make it easy to write your own functions that work with files or any other reader/writer interface.
Between the os, io, and ioutil packages, you can find the right function for your needs. These examples cover a number of the options available.
The following example uses the io.Copy() function to copy the contents from one reader to another writer:
package main
import (
"io"
"log"
"os"
)
func main() {
// Open original file
originalFile, err := os.Open("test.txt")
if err != nil {
log.Fatal(err)
}
defer originalFile.Close(...