Generates a random sequence of letters/numbers (for a sessionid or something)

randomsequence.go

package main

import (
	"flag"
	"fmt"
	"math/rand"
	"time"
)

var letters = []rune("abcdefghijklmnopqrstuvwxyz-+=.ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890")

func main() {
	//	Our flags
	length := flag.Int("length", 10, "Length of the sequence to generate")

	//	Parse the command line for flags:
	flag.Parse()

	//	Print out our sequence
	fmt.Println(randSeq(*length))
}

func randSeq(n int) string {
	//	Seed the random number generator with the current time
	rand.Seed(time.Now().UTC().UnixNano())

	//	Create a slice of runes of the correct length:
	b := make([]rune, n)

	//	For each item in the slice, get a random character:
	for i := range b {
		b[i] = letters[rand.Intn(len(letters))]
	}

	//	Return the string:
	return string(b)
}