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   "source": [
    "# Working with the Unix Shell 1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 0**. (20 points)\n",
    "\n",
    "- Start the [Vim tutorial](http://www.openvim.com)\n",
    "- Start `emacs` and enter `C-h t` to start the tutorial.\n",
    "\n",
    "When you have completed each tutorial, declare \"I have completed the (vi|emacs) tutorial below\" for 10 points each."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 1**. List the folders and files in your home directory, including hidden files. (5 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 2.1**. Create the following empty file: `~/turtle/turtle/turrtle/all_the_way_down.txt` (5 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 2.2**. Using only Unix shell commands, put the following text into the empty file created in Exercise 2.1 (5 points)\n",
    "\n",
    "```\n",
    "One, two,\n",
    "Buckle my shoe;\n",
    "Three, four,\n",
    "Knock at the door;\n",
    "Five, six,\n",
    "Pick up sticks;\n",
    "Seven, eight,\n",
    "Lay them straight:\n",
    "Nine, ten,\n",
    "A big fat hen;\n",
    "```\n",
    "\n",
    "[Source](https://en.wikipedia.org/wiki/One,_Two,_Buckle_My_Shoe)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 2.3**: Append the following lines to the same file. (5 points)\n",
    "\n",
    "```\n",
    "Eleven, twelve,\n",
    "Dig and delve;\n",
    "Thirteen, fourteen,\n",
    "Maids a-courting;\n",
    "Fifteen, sixteen,\n",
    "Maids in the kitchen;\n",
    "Seventeen, eighteen,\n",
    "Maids in waiting\n",
    "Nineteen, twenty,\n",
    "My plate's empty.\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 2.4**. Print ONLY the date and time the file `~/turtle/turtle/turrtle/all_the_way_down.txt` was last modified. (10 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 2.5**. Replace all occurrences of the lower case vowels \"aeiou\" in `~/turtle/turtle/turrtle/all_the_way_down.txt` with the equivalent upper case vowel. (10 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 2.6**. Delete the directory `~/turtle` and all its sub-directories and files. (5 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "**Exercise 3**. Find all files in the current directory with the word \"buckle\" (case insensitive) and print their names. (5 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 4**. Download the following file `https://archive.ics.uci.edu/ml/machine-learning-databases/iris/iris.data` into a file `iris.csv'. Create a new file `iris24.csv` containing just columsn 2 and 4 of `iris.csv`. (10 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 5**. Using `emasc` or `vi` (we trust your honesty not to use any other editor), write a bash shell script that finds the average of all numbers in a file that has only 1 column of numbers. Using the script, find the average of the 3rd column of `iris.csv`. (20 points)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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