diff --git a/commands/linux.ipynb b/commands/linux.ipynb
index 54a84da..3fa8a5c 100644
--- a/commands/linux.ipynb
+++ b/commands/linux.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:e595a63f61ca91bdd492a8932695aa68c3ef680260edee4cfe01574de3e4a431"
+  "signature": "sha256:8cd9b925468d91a5445fbecd65918d54988bc825d74728cb9bb0d22c193e03ed"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -164,6 +164,47 @@
      "language": "python",
      "metadata": {},
      "outputs": []
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## Grep"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Check number of files matching \u201c.txt\":"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "ls -1 | grep .txt | wc -l"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Check number of MapReduce records processed, outputting the results to the terminal:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "cat * | grep -c \"foo\" folder/part*"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
     }
    ],
    "metadata": {}