Separeted CommandExecutor for different OS

PHPCI/Helper/UnixCommandExecutor.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace PHPCI\Helper;
+
+class UnixCommandExecutor extends BaseCommandExecutor
+{
+    /**
+     * Find a binary required by a plugin.
+     * @param string $binary
+     * @return null|string
+     */
+    public function findBinary($binary)
+    {
+        $binaryPath = parent::findBinary($binary);
+        if (is_null($binaryPath)) {
+
+            if (is_string($binary)) {
+                $binary = array($binary);
+            }
+
+            foreach ($binary as $bin) {
+                $findCmdResult = trim(shell_exec('which ' . $bin));
+
+                if (!empty($findCmdResult)) {
+                    $this->logger->log("Found in " . $findCmdResult, LogLevel::DEBUG);
+                    $binaryPath = $findCmdResult;
+                    break;
+                }
+            }
+        }
+        return $binaryPath;
+    }
+}