Write a huge file in Go

huge_file.go

package main

import (
	"fmt"
	"os"
	"strings"
)

func main() {
	f, err := os.Create("/tmp/dat2")
	if err != nil {
		panic(err)
	}

	defer f.Close()

	fmt.Println("Writing data...")

	gbs := 30 // How many GBs you want to write

	kb := strings.Repeat("1234567890", 100) // 10 bytes * 100 = 1KB string
	mb := strings.Repeat(kb, 1000)          // 1000 bytes * 1KB = 1MB string
	for i := 0; i < gbs*1000; i++ {
		_, err := f.Write([]byte(mb))
		if err != nil {
			panic(err)
		}
		if i%100 == 0 {
			fmt.Printf("Wrote %d/%dk MBs\n", i, gbs)
		}
	}

	fmt.Println("Writing done.")
}