1. The Shell We'll be doing a fair bit of work on the command line this trimester, so the first part of this assignment is to learn about the UNIX/Linux shell. There's a very good treatment of the shell in MIT's [_The Missing Semester of Your CS Education_](https://missing.csail.mit.edu/) lecture series and the first task is to read 1. 1. and to complete a couple of simple exercises. There are lecture videos from the MIT course, available on YouTube and embedded in the web page, but viewing the lecture videos is _optional_. Complete the following simple exercises: 1. In the fenced code block below, paste the one-line command and output which will list the [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) (`#!`) line (if present) of all the (`*.py`) files in your repository. The output should be 8-lines in length. **Hint** use `find` to find the files and execute `grep` on the list of files to select the shebang line(s) from the files. **Answer:** ```shell $ ``` 2. The data recorder output log looks like: ```text 2023-02-09 16:00:08 DEBUG main: machine.wake_reason(): 0 2023-02-09 16:00:08 DEBUG main: machine.reset_cause(): 3 2023-02-09 16:00:08 INFO main: Entering Regular Mode ... 2023-02-09 16:00:22 INFO main: Entering deep sleep for 578 s (9.6 minutes) 2023-02-09 16:10:08 DEBUG main: machine.wake_reason(): 4 2023-02-09 16:10:08 DEBUG main: machine.reset_cause(): 4 2023-02-09 16:10:08 INFO main: Entering Regular Mode ... 2023-02-09 16:10:22 INFO main: Entering deep sleep for 578 s (9.6 minutes) ... 2023-02-09 16:10:08 DEBUG main: machine.wake_reason(): 4 2023-02-09 16:10:08 DEBUG main: machine.reset_cause(): 4 2023-02-09 16:10:08 INFO main: Entering Regular Mode ``` Let's say we need to analyse the occurrence of the different wake reasons. What is the `grep` command to show just the text `machine.wake_reason() ...`? You might find it helpful to save the sample log above to a file to test. **Hint:** read the manual page (`man grep`) to find the flag to only show the matching text and use the short regular expression `.*` in your `grep` match string to match any string of characters. **Answer:** `` 3. Log analysis with `grep` can generate lots of lines, potentially 10's of thousands. The commands `sort` and `uniq -c` (see `man uniq` for details of this command and its flag) can help with the analysis, but how would you connect the output of `grep` to the input of `sort` and the output of `sort` to the input of `uniq -c`?

1. The Shell We'll be doing a fair bit of work on the command line this trimester, so the first part of this assignment is to learn about the UNIX/Linux shell. There's a very good treatment of the shell in MIT's [_The Missing Semester of Your CS Education_](https://missing.csail.mit.edu/) lecture series and the first task is to read 1. 1. and to complete a couple of simple exercises. There are lecture videos from the MIT course, available on YouTube and embedded in the web page, but viewing the lecture videos is _optional_. Complete the following simple exercises: 1. In the fenced code block below, paste the one-line command and output which will list the [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) (`#!`) line (if present) of all the (`.py`) files in your repository. The output should be 8-lines in length. Hint use `find` to find the files and execute `grep` on the list of files to select the shebang line(s) from the files. Answer: ```shell $ ``` 2. The data recorder output log looks like: ```text 2023-02-09 16:00:08 DEBUG main: machine.wake_reason(): 0 2023-02-09 16:00:08 DEBUG main: machine.reset_cause(): 3 2023-02-09 16:00:08 INFO main: Entering Regular Mode ... 2023-02-09 16:00:22 INFO main: Entering deep sleep for 578 s (9.6 minutes) 2023-02-09 16:10:08 DEBUG main: machine.wake_reason(): 4 2023-02-09 16:10:08 DEBUG main: machine.reset_cause(): 4 2023-02-09 16:10:08 INFO main: Entering Regular Mode ... 2023-02-09 16:10:22 INFO main: Entering deep sleep for 578 s (9.6 minutes) ... 2023-02-09 16:10:08 DEBUG main: machine.wake_reason(): 4 2023-02-09 16:10:08 DEBUG main: machine.reset_cause(): 4 2023-02-09 16:10:08 INFO main: Entering Regular Mode ``` Let's say we need to analyse the occurrence of the different wake reasons. What is the `grep` command to show just the text `machine.wake_reason() ...`? You might find it helpful to save the sample log above to a file to test. Hint: read the manual page (`man grep`) to find the flag to only show the matching text and use the short regular expression `.` in your `grep` match string to match any string of characters. Answer: `` 3. Log analysis with `grep` can generate lots of lines, potentially 10's of thousands. The commands `sort` and `uniq -c` (see `man uniq` for details of this command and its flag) can help with the analysis, but how would you connect the output of `grep` to the input of `sort` and the output of `sort` to the input of `uniq -c`?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

1. The Shell

We'll be doing a fair bit of work on the command line this trimester, so the first part of this assignment is to learn about the UNIX/Linux shell.

There's a very good treatment of the shell in MIT's [_The Missing Semester of Your CS Education_](https://missing.csail.mit.edu/) lecture series and the first task is to read

1. <https://missing.csail.mit.edu/2020/course-shell/>

1. <https://missing.csail.mit.edu/2020/shell-tools/>

and to complete a couple of simple exercises. There are lecture videos from the MIT course, available on YouTube and embedded in the web page, but viewing the lecture videos is _optional_.

Complete the following simple exercises:

1. In the fenced code block below, paste the one-line command and output which will list the [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) (`#!`) line (if present) of all the (`*.py`) files in your repository. The output should be 8-lines in length. **Hint** use `find` to find the files and execute `grep` on the list of files to select the shebang line(s) from the files.

**Answer:**

```shell

$ <insert command here>

```

2. The data recorder output log looks like:

```text

2023-02-09 16:00:08 DEBUG main: machine.wake_reason(): 0

2023-02-09 16:00:08 DEBUG main: machine.reset_cause(): 3

2023-02-09 16:00:08 INFO main: Entering Regular Mode

...

2023-02-09 16:00:22 INFO main: Entering deep sleep for 578 s (9.6 minutes)

2023-02-09 16:10:08 DEBUG main: machine.wake_reason(): 4

2023-02-09 16:10:08 DEBUG main: machine.reset_cause(): 4

2023-02-09 16:10:08 INFO main: Entering Regular Mode

...

2023-02-09 16:10:22 INFO main: Entering deep sleep for 578 s (9.6 minutes)

...

2023-02-09 16:10:08 DEBUG main: machine.wake_reason(): 4

2023-02-09 16:10:08 DEBUG main: machine.reset_cause(): 4

2023-02-09 16:10:08 INFO main: Entering Regular Mode

```

Let's say we need to analyse the occurrence of the different wake reasons. What is the `grep` command to show just the text `machine.wake_reason() ...`? You might find it helpful to save the sample log above to a file to test. **Hint:** read the manual page (`man grep`) to find the flag to only show the matching text and use the short regular expression `.*` in your `grep` match string to match any string of characters.

**Answer:** `<insert command here>`

3. Log analysis with `grep` can generate lots of lines, potentially 10's of thousands. The commands `sort` and `uniq -c` (see `man uniq` for details of this command and its flag) can help with the analysis, but how would you connect the output of `grep` to the input of `sort` and the output of `sort` to the input of `uniq -c`?

**Answer:** ...

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