1  'use strict';
 2  var shebangRegex = require('shebang-regex');
 3  
 4  module.exports = function (str) {
 5  	var match = str.match(shebangRegex);
 6  
 7  	if (!match) {
 8  		return null;
 9  	}
10  
11  	var arr = match[0].replace(/#! ?/, '').split(' ');
12  	var bin = arr[0].split('/').pop();
13  	var arg = arr[1];
14  
15  	return (bin === 'env' ?
16  		arg :
17  		bin + (arg ? ' ' + arg : '')
18  	);
19  };