files
Examples of creating, opening, writing, reading, closing, and deleting files.
Node.js
const fs = require('fs')
// create file
fs.closeSync(fs.openSync('test.txt', 'w'))
// open file (returns file descriptor)
const fd = fs.openSync('test.txt', 'r+')
let wbuf = Buffer.from('hello world.')
let rbuf = Buffer.alloc(12)
let off = 0
let len = 12
let pos = 0
// write file
fs.writeSync(fd, wbuf, pos)
// read file
fs.readSync(fd, rbuf, off, len, pos)
console.log(rbuf.toString())
// close file
fs.closeSync(fd)
// delete file
fs.unlinkSync('test.txt')
Output
hello world.
Go
package main
import (
"fmt"
"os"
"syscall"
)
func main() {
// create file
file, err := os.Create("test.txt")
if err != nil {
panic(err)
}
// close file
file.Close()
// open file
file, err = os.OpenFile("test.txt", os.O_RDWR, 0755)
if err != nil {
panic(err)
}
// file descriptor
fd := file.Fd()
// open file (using file descriptor)
file = os.NewFile(fd, "test file")
wbuf := []byte("hello world.")
rbuf := make([]byte, 12)
var off int64
// write file
if _, err := file.WriteAt(wbuf, off); err != nil {
panic(err)
}
// read file
if _, err := file.ReadAt(rbuf, off); err != nil {
panic(err)
}
fmt.Println(string(rbuf))
// close file (using file descriptor)
if err := syscall.Close(int(fd)); err != nil {
panic(err)
}
// delete file
if err := os.Remove("test.txt"); err != nil {
panic(err)
}
}
Output
hello world.
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