text: const foreach = require('guld-fs-foreach')
  const spawn = require('guld-spawn').getSpawn()
  
  async function strReplace (oldstr, newstr, args) {
    return foreach(args[0], async f => {
      if (f === '') return
      var resp = await spawn('sed', '', ['-i', `s/${oldstr}/${newstr}/g`, f], true)
      return resp
    }, args.slice(1))
  }
  
  module.exports = strReplace
  