{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Unix Basics Quiz\n",
    "\n",
    "Only use the command line to do all these tasks. Do not use an editor unless explicitly asked for."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Using the command line"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**1**. What do these key combinations do in an interactive bash session?\n",
    "\n",
    "- CTRL-b, CTRL-f, CTRL-d, CTRL-t, ESC-b, ESC-f, ESC-d, CTRL-a, CTRL-e, CTRL-k, CTRL-y, CTRL-r, CTRL-n, CTRL-p?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**2**. How do you save a file and exit \n",
    "\n",
    "- an emacs session?\n",
    "- a vi session?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**3**. How cna you view the last 10 commands issued?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**4**. How do you find all commands that begin with `gr`?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Working with directories"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**5**. How do you create\n",
    "\n",
    "- a new directory?\n",
    "- nested directories?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**6**. How do you remove\n",
    "\n",
    "- an empty directory?\n",
    "- a non-empty directory?\n",
    "- nested directories?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**7**. How do you navigate\n",
    "\n",
    "- to a new directory\n",
    "- back to your previous directory\n",
    "- to your home directory"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**8**. How do you print your current directory?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Working with files"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**9**. How do you create a new empty file?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**10** How do you create the text \"Hello world\" in a new file called `hello.txt`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**11**.. How do you append \"Goodbye cruel world\" to `hello.txt`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**12**. Edit the `hello.txt` in emacs and delete the word `cruel` then save the file."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**13**. Edit `hello.txt` in vi and put the word `creul` back in its original position and save the file."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**14**. Copy the file `hello.txt` to `goodbye.txt`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**15**. Combine the contents of `hello.txt` and `goodbye.txt` to a new file `hello_goodbye.txt`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**16**. Move the files `hello.txt`, `goodbye.txt` and `hello_goodbye.txt` to a sub-directory called `text`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**17**. Delete the file `hello.txt` in `text`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**18**. Pipe lines 10-20 of `EntryQuiz.ipynb` to the `wc` command. What does the output of `wc` mean?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Compression, archival and checksums"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**19**. Use `gzip` to compress the file `hello_goodbye.txt`. Report the size of the file in bytes before and after compression."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**20**. Use `gunzip` to uncompress and recover the file `hello_goodbye.txt`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**21**. Create a file called MD5SUM of the MD5 checksums of the three text files in the directory. Keep MD5SUM in the parent directory of `text` - i.e. in the current directory."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**22**. Use `tar` to combine and compress all the filesi in the `text` directory into a file `text.tar.gz`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**23**. Delete the `text` directory and all its contents recursively."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**24**. Use `tar` to recover the `text` directory from `text.tar.gz`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**25**. Check that no files have been corrupted by the `tar` forward and backward processes."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Clean up"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**26**. Delete all files and directories created in this session."
   ]
  }
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