Refactored structure

src/PHPCI/Helper/UnixCommandExecutor.php

@@ -0,0 +1,27 @@
+<?php
+/**
+ * PHPCI - Continuous Integration for PHP
+ *
+ * @copyright    Copyright 2014, Block 8 Limited.
+ * @license      https://github.com/Block8/PHPCI/blob/master/LICENSE.md
+ * @link         https://www.phptesting.org/
+ */
+
+namespace PHPCI\Helper;
+
+/**
+ * Unix/Linux specific extension of the CommandExecutor class.
+ * @package PHPCI\Helper
+ */
+class UnixCommandExecutor extends BaseCommandExecutor
+{
+    /**
+     * Uses 'which' to find a system binary by name.
+     * @param string $binary
+     * @return null|string
+     */
+    protected function findGlobalBinary($binary)
+    {
+        return trim(shell_exec('which ' . $binary));
+    }
+}