How to properly seed random number generator

Question

I am trying to generate a random string in Go and here is the code I have written so far:

package main

import (
    \"bytes\"
    \"fmt\"
    \"math/rand\"
         


        

Answer 1

It's nano seconds, what are the chances of getting the same seed twice.
Anyway, thanks for the help, here is my end solution based on all the input.

package main

import (
    "math/rand"
    "time"
)

func init() {
    rand.Seed(time.Now().UTC().UnixNano())
}

// generates a random string
func srand(min, max int, readable bool) string {

    var length int
    var char string

    if min < max {
        length = min + rand.Intn(max-min)
    } else {
        length = min
    }

    if readable == false {
        char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
    } else {
        char = "ABCDEFHJLMNQRTUVWXYZabcefghijkmnopqrtuvwxyz23479"
    }

    buf := make([]byte, length)
    for i := 0; i < length; i++ {
        buf[i] = char[rand.Intn(len(char)-1)]
    }
    return string(buf)
}

// For testing only
func main() {
    println(srand(5, 5, true))
    println(srand(5, 5, true))
    println(srand(5, 5, true))
    println(srand(5, 5, false))
    println(srand(5, 7, true))
    println(srand(5, 10, false))
    println(srand(5, 50, true))
    println(srand(5, 10, false))
    println(srand(5, 50, true))
    println(srand(5, 10, false))
    println(srand(5, 50, true))
    println(srand(5, 10, false))
    println(srand(5, 50, true))
    println(srand(5, 4, true))
    println(srand(5, 400, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
    println(srand(6, 5, true))
}