add notes for tree` commands (#2264)

* add note for tree commands

* add note for tree commands

examples/hello-world/step-by-step/cifar10/sag_with_deploy_map/sag_deploy_map.ipynb

@@ -181,6 +181,15 @@
     "-force"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "932c4b05-c370-4513-8bd8-5c05962d5696",
+   "metadata": {},
+   "source": [
+    ">Note:\n",
+    "In the upcoming sections, we'll utilize the 'tree' command. To install this command on a Linux system, you can use the sudo apt install tree command. As an alternative to 'tree', you can use the ls -al command."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,

examples/hello-world/step-by-step/cifar10/stats/image_stats.ipynb

@@ -470,6 +470,15 @@
     "Now let's look closer at the configurations, in particular, the client side, and make sure it matches to the new class we just created"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "379cbf3b-b058-4b5a-b3f8-aa6824f0cf2d",
+   "metadata": {},
+   "source": [
+    ">Note: \n",
+    "In the upcoming sections, we'll utilize the 'tree' command. To install this command on a Linux system, you can use the sudo apt install tree command. As an alternative to 'tree', you can use the ls -al command."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,

examples/hello-world/step-by-step/higgs/sklearn-kmeans/sklearn_kmeans.ipynb

@@ -63,6 +63,15 @@
     "%pip install -r requirements.txt"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "cd59e545-77d9-4cc4-9047-298ceff450e1",
+   "metadata": {},
+   "source": [
+    "> Note: \n",
+    "In the upcoming sections, we'll utilize the 'tree' command. To install this command on a Linux system, you can use the sudo apt install tree command. As an alternative to 'tree', you can use the ls -al command."
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "5f87c3da-59dc-4551-9448-b20b64a57137",
@@ -471,7 +480,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.13"
+   "version": "3.8.16"
   }
  },
  "nbformat": 4,

examples/hello-world/step-by-step/higgs/sklearn-linear/sklearn_linear.ipynb

@@ -63,6 +63,17 @@
     "%pip install -r requirements.txt"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "65da6755-609d-44f2-844f-01fb3bda1bd0",
+   "metadata": {
+    "tags": []
+   },
+   "source": [
+    ">Note:\n",
+    "In the upcoming sections, we'll utilize the 'tree' command. To install this command on a Linux system, you can use the sudo apt install tree command. As an alternative to 'tree', you can use the ls -al command."
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "5f87c3da-59dc-4551-9448-b20b64a57137",

examples/hello-world/step-by-step/higgs/sklearn-svm/sklearn_svm.ipynb

@@ -63,6 +63,15 @@
     "%pip install -r requirements.txt"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "50af50ec-ae21-4711-aa88-3ddacf0b5d01",
+   "metadata": {},
+   "source": [
+    ">Note:\n",
+    "In the upcoming sections, we'll utilize the 'tree' command. To install this command on a Linux system, you can use the sudo apt install tree command. As an alternative to 'tree', you can use the ls -al command."
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "5f87c3da-59dc-4551-9448-b20b64a57137",

examples/hello-world/step-by-step/higgs/stats/tabular_stats.ipynb

@@ -56,6 +56,15 @@
     "%pip install -r requirements.txt"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "3ed5db39-b8f6-42bd-9610-6e671f17a6ea",
+   "metadata": {},
+   "source": [
+    ">Note:\n",
+    "In the upcoming sections, we'll utilize the 'tree' command. To install this command on a Linux system, you can use the sudo apt install tree command. As an alternative to 'tree', you can use the ls -al command."
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "f3d5cd9a-3da9-446c-aac0-6ae84bf0ead1",

examples/hello-world/step-by-step/higgs/xgboost/xgboost_horizontal.ipynb

@@ -63,6 +63,15 @@
     "%pip install -r requirements.txt"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "952a7361-f9ab-4673-9e37-acadc89847da",
+   "metadata": {},
+   "source": [
+    ">Note:\n",
+    "In the upcoming sections, we'll utilize the 'tree' command. To install this command on a Linux system, you can use the sudo apt install tree command. As an alternative to 'tree', you can use the ls -al command.\n"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "5f87c3da-59dc-4551-9448-b20b64a57137",

examples/tutorials/job_cli.ipynb

@@ -247,7 +247,7 @@
     "The above command creates a job folder at ```/tmp/nvflare/my_job``` with job template ```sag_pt```. \n",
     "You can see that a few configuration files are created. Some of the configurations are open for you to overwrite.\n",
     "\n",
-    "If you have the ```tree``` command installed ( ```python -m pip install``` on linux), you can use the ```tree``` command, otherwise, you can use \"ls -al\" to look at the job_folder structure:"
+    "If you have the ```tree``` command installed ( ```sudo apt install tree``` on linux), you can use the ```tree``` command, otherwise, you can use \"ls -al\" to look at the job_folder structure:"
    ]
   },
   {