code: function escapeshellarg(arg) {
      // Quote and escape an argument for use in a shell command
      //
      // version: 1109.2015
      // discuss at: http://phpjs.org/functions/escapeshellarg
      // +   original by: Felix Geisendoerfer (http://www.debuggable.com/felix)
      // +   improved by: Brett Zamir (http://brett-zamir.me)
      // *     example 1: escapeshellarg("kevin's birthday");
      // *     returns 1: "'kevin\'s birthday'"
      var ret = '';
  
      ret = arg.replace(/[^\\]'/g, function (m, i, s) {
          return m.slice(0, 1) + '\\\'';
      });
  
      return "'" + ret + "'";
    }
docs: http://phpjs.org/functions/escapeshellarg:866