fd move test

file.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"time"
)

func main() {
	f, _ := os.Open("hello.txt")
	fmt.Println("Sleeping while file is renamed")
	time.Sleep(time.Second * 10)
	fmt.Println("opening same file with new name")
	f1, _ := os.Open("hello1.txt")

	d, _ := ioutil.ReadAll(f)
	d1, _ := ioutil.ReadAll(f1)
	fmt.Println(string(d))
	fmt.Println(string(d1))

	s, _ := f.Stat()
	s1, _ := f1.Stat()
	fmt.Println(s.Name())
	fmt.Println(s1.Name())
}

Example output:

$ go run file.go
Sleeping
opening new file
123
456
123
456
hello.txt
hello1.txt