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golangHow to overwrite content in file if it exists


package main

import (
	"os"
)

func main() {
	f, _ := os.OpenFile("/tmp/go.txt", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
  defer f.Close()
  f.WriteString("new content\n")
}ctrl + c
package main

default package declaration

"os"

include operating-system level library

func main() {

declare main function that will be launched automatically

os.OpenFile

opens file handler

/tmp/go.txt

path to file to open

os.O_APPEND|os.O_CREATE|os.O_WRONLY

permissions used to append to file

0644

file permissions to set

defer f.Close()

deferred file handler close

WriteString

writes string to a given file