Get the account ID for an AWS account (assuming that credentials file is present)

get_aws_account_id.go

package main

import (
	"fmt"

	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/sts"
)

func main() {
	svc := sts.New(session.New())
	input := &sts.GetCallerIdentityInput{}

	result, err := svc.GetCallerIdentity(input)
	if err != nil {
		if aerr, ok := err.(awserr.Error); ok {
			switch aerr.Code() {
			default:
				fmt.Println(aerr.Error())
			}
		} else {
			// Print the error, cast err to awserr.Error to get the Code and
			// Message from an error.
			fmt.Println(err.Error())
		}
		return
	}

	account := *result.Account
	fmt.Println(account)
}