How to make mac run shell on startup

Write a simple shell, like： 123456789101112#!/bin/bashHOME=/rootLOGNAME=rootPATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/binLANG=en_US.UTF-8SHELL=/bin/bashPWD=/rootcd /Users/bejond/