OpenClose.go

package main


import (
	"log"
	"os"
)

func main() {
	// Simple read only open. We will cover actually reading
	// and writing to files in examples further down the page
	file, err := os.Open("test2.txt")
	if err != nil {
		log.Fatal(err)
	}
	file.Close()

	// OpenFile with more options. Last param is the permission mode
	// Second param is the attributes when opening
	file, err = os.OpenFile("test2.txt", os.O_APPEND, 0666)
	if err != nil {
		log.Fatal(err)
	}
	file.Close()

	// Use these attributes individually or combined
	// with an OR for second arg of OpenFile()
	// e.g. os.O_CREATE|os.O_APPEND
	// or os.O_CREATE|os.O_TRUNC|os.O_WRONLY

	// os.O_RDONLY // Read only
	// os.O_WRONLY // Write only
	// os.O_RDWR // Read and write
	// os.O_APPEND // Append to end of file
	// os.O_CREATE // Create is none exist
	// os.O_TRUNC // Truncate file when opening
}