remix-project/remix-simulator/bin/ethsim

#!/usr/bin/env node

const program = require('commander')
const version = require('../package.json').version

program
  .command('version')
  .description("outputs version number")
  .action(() => {
    console.log(version)
    process.exit(0)
  })

program
  .command('help')
  .description("outputs usage information")
  .action(() => {
    program.help()
    process.exit(0)
  })

program
  .option('-p, --port [port]', 'specify port')
  .parse(process.argv)

const Server = require('../src/server')
const server = new Server()
server.start(program.port || 8545)