Security with Go

Writing bytes to a file

You can write using just the os package, which is needed already to open the file. Since all Go executables are statically linked binaries, every package you import increases the size of your executable. Other packages such as io, ioutil, and bufio provide some more help, but they are not necessary:

package main 
 
import ( 
   "log" 
   "os" 
) 
 
func main() { 
   // Open a new file for writing only 
   file, err := os.OpenFile( 
      "test.txt", 
      os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 
      0666, 
   ) 
   if err != nil { 
      log.Fatal(err) 
   } 
   defer file.Close() 
 
   // Write bytes to file 
   byteSlice := []byte("Bytes!\n") 
   bytesWritten, err := file.Write(byteSlice) 
   if err != nil { 
      log.Fatal(err) 
   } 
   log.Printf("Wrote %d bytes.\n", bytesWritten) 
}