diff --git a/spark/spark.ipynb b/spark/spark.ipynb
index 9387c7f..ce1b437 100644
--- a/spark/spark.ipynb
+++ b/spark/spark.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:90f5d3daae548071bd0d43ab169b91ef919dded25d9df7effad349b4ec3641bb"
+  "signature": "sha256:b92b25c3049cb5859029a2d6232ea44923a8ac687cfb4a5a2271cfae4b02c773"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -376,8 +376,8 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "sudo service spark-master start\n",
-      "sudo service spark-worker start"
+      "!sudo service spark-master start\n",
+      "!sudo service spark-worker start"
      ],
      "language": "python",
      "metadata": {},
@@ -394,8 +394,8 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "sudo service spark-master stop\n",
-      "sudo service spark-worker stop"
+      "!sudo service spark-master stop\n",
+      "!sudo service spark-worker stop"
      ],
      "language": "python",
      "metadata": {},
@@ -412,8 +412,8 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "sudo service spark-master stop\n",
-      "sudo service spark-worker stop"
+      "!sudo service spark-master stop\n",
+      "!sudo service spark-worker stop"
      ],
      "language": "python",
      "metadata": {},
@@ -447,7 +447,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "MASTER=spark://localhost:7077 pyspark"
+      "!MASTER=spark://localhost:7077 pyspark"
      ],
      "language": "python",
      "metadata": {},
@@ -713,7 +713,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "spark-submit --properties-file dir/myspark.conf script.py data/*"
+      "!spark-submit --properties-file dir/myspark.conf script.py data/*"
      ],
      "language": "python",
      "metadata": {},