Files and I/O

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Go has a very robust support for working with files.

Here's a program that opens a file, reads its content and closes the file:

path := "read file into lines.go"
f, err := os.Open(path)
if err != nil {
	log.Fatalf("os.Open() failed with %s\n", err)
defer f.Close()

d, err := ioutil.ReadAll(f)
if err != nil {
	log.Fatalf("ioutil.ReadAll() failed with '%s'\n", err)

lines := bytes.Split(d, []byte{'\n'})
fmt.Printf("File '%s' has %d lines\n", path, len(lines))
File 'read file into lines.go' has 29 lines

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