Add "output" alias to append output file

Command.php

@@ -267,6 +267,14 @@ public function file(string $source, bool $checkIfFileExists = true, bool $appen
         return $this;
     }
 
+    /**
+     * Add an output file to the end of the command.
+     */
+    public function output(string $source): self
+    {
+        return $this->file($source, false, true);
+    }
+
     /**
      * Checks if file exists in the filesystem.
      */