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Filename : index.js

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'use strict';
var shebangRegex = require('shebang-regex');

module.exports = function (str) {
	var match = str.match(shebangRegex);

	if (!match) {
		return null;
	}

	var arr = match[0].replace(/#! ?/, '').split(' ');
	var bin = arr[0].split('/').pop();
	var arg = arr[1];

	return (bin === 'env' ?
		arg :
		bin + (arg ? ' ' + arg : '')
	);
};