update

module6.ipynb

@@ -299,6 +299,65 @@
     "echo *\n",
     "echo ?????.py"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Conditional execution in Bash"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "if test -n \"$PATH\"; then echo \"Your path is not empty\"; fi"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Advanced Bash Concepts"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## While loops in Bash scripts"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "n=1\n",
+    "while [ $n -le 5 ]; do\n",
+    "  echo \"Iteration number $n\"\n",
+    "  ((n+=1))\n",
+    "done"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#!/bin/bash\n",
+    "n=0\n",
+    "command=$1\n",
+    "while ! $command && [ $n -le 5 ]; do\n",
+    "        sleep $n\n",
+    "        ((n+=1))\n",
+    "        echo \"Retry #$n\"\n",
+    "done;"
+   ]
   }
  ],
  "metadata": {