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writeFile.go
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writeFile.go
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package main
import (
"bufio"
"fmt"
"io"
"os"
)
func main() {
buffer := []byte("Data to write\n")
f1, err := os.Create("/tmp/f1.txt")
if err != nil {
fmt.Println("Cannot create file", err)
return
}
defer f1.Close()
fmt.Fprintf(f1, string(buffer))
f2, err := os.Create("/tmp/f2.txt")
if err != nil {
fmt.Println("Cannot create file", err)
return
}
defer f2.Close()
n, err := f2.WriteString(string(buffer))
fmt.Printf("wrote %d bytes\n", n)
f3, err := os.Create("/tmp/f3.txt")
if err != nil {
fmt.Println(err)
return
}
w := bufio.NewWriter(f3)
n, err = w.WriteString(string(buffer))
fmt.Printf("wrote %d bytes\n", n)
w.Flush()
f := "/tmp/f4.txt"
f4, err := os.Create(f)
if err != nil {
fmt.Println(err)
return
}
defer f4.Close()
for i := 0; i < 5; i++ {
n, err = io.WriteString(f4, string(buffer))
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("wrote %d bytes\n", n)
}
// Append to a file
f4, err = os.OpenFile(f, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
fmt.Println(err)
return
}
defer f4.Close()
// Write() needs a byte slice
n, err = f4.Write([]byte("Put some more data at the end.\n"))
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("wrote %d bytes\n", n)
}