Fix various small things

* Leave directory clean by removing temporary directory
* Change processes to list from chrome to python
* Fix typos

Author: gjbex

hands-on/shell_interaction.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Intereacting with the shell"
+    "# Interacting with the shell"
    ]
   },
   {
@@ -18,7 +18,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "The [`sh` module](https://amoffat.github.io/sh/) is very convenient to interact with the shell.  Note that `sh` is not part of Python's standard library, if you prefer not to use extra modules, use the `subprocess` module in the standard library."
+    "The [`sh` module](https://amoffat.github.io/sh/) is very convenient to interact with the shell.  Note that `sh` is not part of Python's standard library, if you prefer not to use extra modules, use the `subprocess` module in the standard library.  The statements below will install `sh` using `pip` is it isn't already installed."
    ]
   },
   {
@@ -27,16 +27,12 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pip install sh"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "import sh"
+    "try:\n",
+    "    import sh\n",
+    "except ModuleNotFoundError:\n",
+    "    print('installing sh using pip')\n",
+    "    !pip install sh\n",
+    "    import sh"
    ]
   },
   {
@@ -314,7 +310,9 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {},
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
    "source": [
     "try:\n",
@@ -323,6 +321,29 @@
     "    print(error)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Clean up"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Remove the `tmp` directory."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sh.rm('-rf', 'tmp')"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -605,11 +626,43 @@
     "                         env=environ, shell=True)\n",
     "print(process.stdout.rstrip())"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Clean up"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Remove the `tmp` directory."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "process = subprocess.run(['rm', '-rf', 'tmp'])"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "process.returncode"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -623,9 +676,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.5"
+   "version": "3.11.3"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }