code: function sleep(seconds) {
    const time = parseFloat(seconds, 10);
    if (!_.isFinite(time)) { throw new Error(`invalid time interval '${seconds}'`); }
    runProgram('sleep', [time], {logCommand: false});
  }
docs: Wait the specified amount of seconds
  @function $util~sleep
  @param {string} seconds - Seconds to wait
  @example
  // Wait for 5 seconds
  $util.sleep(5);