notebooks/unit01/unit01_03.ipynb

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   "source": [
    "This notebook was prepared by Cayetano Benavent, 2016."
   ]
  },
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   "cell_type": "markdown",
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   "source": [
    "# Executing Python scripts from the command line"
   ]
  },
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   "cell_type": "markdown",
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   "source": [
    "Open a text editor and type:"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "```python\n",
    "print(\"Hello, world!\")\n",
    "```"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Save file to disk with this name: \n",
    "\n",
    "    helloworld.py\n",
    "    \n",
    "*Remark: If we are in a Unix-like OS, we can put a shebang line as first line of the script:\n",
    "\n",
    "```#! /usr/bin/env python```"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Open again the command line interface and type:\n",
    "    \n",
    "```\n",
    "$ python helloworld.py\n",
    "```\n",
    "\n",
    "You must see something like this:\n",
    "\n",
    "![Python cli](img/pythoncli.png)\n",
    "\n",
    "\n",
    "To run with Python 3 on Unix-like environments, you must type:\n",
    "\n",
    "```\n",
    "$ python helloworld.py\n",
    "```"
   ]
  }
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