code: function isPortInUse(port) {
    _validatePortFormat(port);
    if (isPlatform('unix')) {
      if (isPlatform('linux') && fileExists('/proc/net')) {
        return _isPortInUseRaw(port);
      } else if (isInPath('netstat')) {
        return _isPortInUseNetstat(port);
      } else {
        throw new Error('Cannot check port status');
      }
    } else {
      throw new Error('Port checking not supported on this platform');
    }
  }
docs: Check if the given port is in use
  @function $net~isPortInUse
  @param {string} port - Port to check
  @returns {boolean} - Whether the port is in use or not
  @example
  // Check if the port 8080 is already in use
  $net.isPortInUse(8080);
  => false