diff --git a/module6.ipynb b/module6.ipynb
index 2da21ad..dfe18e2 100644
--- a/module6.ipynb
+++ b/module6.ipynb
@@ -358,6 +358,94 @@
     "        echo \"Retry #$n\"\n",
     "done;"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## For loops in bash scripts"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#!/bin/bash\n",
+    "for file in *.HTM; do\n",
+    "        name=$(basename \"$file\" .HTM)\n",
+    "        mv \"$file\" \"$name.html\" \n",
+    "done"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#!/bin/bash\n",
+    "for file in *.HTM; do\n",
+    "        name=$(basename \"$file\" .HTM)\n",
+    "        echo mv \"$file\" \"$name.html\" \n",
+    "done"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Advanced Command Interaction"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "tail /var/log/syslog | cut -d' ' -f5-"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "cut -d' ' -f5- /var/log/syslog | sort | uniq -c | sort -nr | head"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#!/bin/bash\n",
+    "\n",
+    "for logfile in /var/log/*log; do\n",
+    "    echo \"Processing: $logfile\"\n",
+    "    cut -d' ' -f5- $logfile | sort | uniq -c | sort -nr | head -5\n",
+    "done"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Choosing between Bash and Python"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "for i in $(cat story.txt); do B=`echo -n \"${i:0:1}\" | tr \"[:lower:]\" \"[:upper:]\"`; echo -n \"${B}${i:1} \"; done; echo -e \"\\n\""
+   ]
   }
  ],
  "metadata": {