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    "### Creating a Python program (not on the notebook) -- _Optional_\n",
    "\n",
    "\n",
    "* Use SSH and connect to your Unix shell\n",
    "* Type `nano helloworld.py` to open `nano`, a (relatively easy to use) text editor, and create the file `helloworld.py`\n",
    "* In the text editor, type:\n",
    "    `print('Hello my dear friend!')`\n",
    "* Type Ctrl+X, to save the file and close the editor.\n",
    "* In the shell prompt, type `python helloworld.py` to see the outcome\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Exercise\n",
    "\n",
    "Open and change the file `helloworld.py` to print your own message.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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   "source": [
    "# execute your steps in the shell"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Creating a self-executing Python program -- _Optional_\n",
    "\n",
    "* Repeat the steps as above, but with the following change: In the first line of your program, type: `#!/usr/bin/python`\n",
    "* Save the file with the name `hello`\n",
    "* In the shell, type `chmod 700 hello`. This makes our file _executable_.\n",
    "* Finally type `./hello` and see what happens."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# execute your steps in the shell"
   ]
  }
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