diff --git a/spark/hdfs.ipynb b/spark/hdfs.ipynb
index 44d7585..96c8af5 100644
--- a/spark/hdfs.ipynb
+++ b/spark/hdfs.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:50db54b924da35ab4fc1dba7b6a4d444e2206d0d631f40b085a56636d739839c"
+  "signature": "sha256:ff0a8cf7aae0fcbadcd718a2f9164affac4fd22893c629a3755198b4f003d63a"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -26,7 +26,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs"
+      "!hdfs"
      ],
      "language": "python",
      "metadata": {},
@@ -43,7 +43,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs"
+      "!hdfs dfs"
      ],
      "language": "python",
      "metadata": {},
@@ -60,7 +60,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -ls"
+      "!hdfs dfs -ls"
      ],
      "language": "python",
      "metadata": {},
@@ -77,7 +77,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -ls /"
+      "!hdfs dfs -ls /"
      ],
      "language": "python",
      "metadata": {},
@@ -94,7 +94,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -put file.txt file.txt"
+      "!hdfs dfs -put file.txt file.txt"
      ],
      "language": "python",
      "metadata": {},
@@ -111,7 +111,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -cat file.txt"
+      "!hdfs dfs -cat file.txt"
      ],
      "language": "python",
      "metadata": {},
@@ -128,7 +128,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -cat file.txt | tail -n 10"
+      "!hdfs dfs -cat file.txt | tail -n 10"
      ],
      "language": "python",
      "metadata": {},
@@ -145,7 +145,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -cat dir/* | less"
+      "!hdfs dfs -cat dir/* | less"
      ],
      "language": "python",
      "metadata": {},
@@ -162,7 +162,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -get file.txt file.txt"
+      "!hdfs dfs -get file.txt file.txt"
      ],
      "language": "python",
      "metadata": {},
@@ -179,7 +179,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -mkdir dir"
+      "!hdfs dfs -mkdir dir"
      ],
      "language": "python",
      "metadata": {},
@@ -196,7 +196,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "hdfs dfs -rm -r dir"
+      "!hdfs dfs -rm -r dir"
      ],
      "language": "python",
      "metadata": {},