var co = require('co');
var read = require('co-read');
var sh = require('co-sh');

co(function *(){
  var ls = yield sh.ls();

  var buf;
  while (buf = yield read(ls.stdout)) {
    console.log(buf.toString());
  }

  try {
    yield sh.nonexistingcmd();
  } catch(e){
    console.log(e);
  }
})();