PHY 494: Homework assignment 2

• Due Tuesday 1/26 midnight.

• Follow the link in Canvas to set up your HW2 repository.

• git clone your repository to your laptop.

• Read the instructions (assignment_02.md) in your text editor or through GitHub.

• Work through the problem, check in your changes into your repository (git add, git commit), and git push your changes to the remote repository on GitHub.

Tests and Autograding: You can check that your answer is correct by running the following command from the top of your working directory:

 pytest

These tests are also ran automatically as soon as you push changes to GitHub. Open "pull request 1" (the Feedback pull request) in your repository on GitHub to see results.

2.1 Copy, rename, delete (10 points)

Work through the Copy, rename, delete: Activity but work with the PHY494 directory in this repository, i.e, you will work under hw02-USERNAME/PHY494 where USERNAME is your GitHub username. Some files and directories under PHY494 are already present in the hw02 repository.

To be clear, all steps that are needed to complete the homework are shown here:

1. Make a backup (call it TODO.bak) of the TODO list with the cp command (in the same directory as the original TODO file).

2. Rename TODO to TODO.txt with the mv command.

3. Make a directory notes under the data directory: You should now have a directory tree similar to

    hw02-USERNAME/PHY494/01_shell/
                      Documents/
                                work/
                                     TODO.txt
                                     TODO.bak
                      data/
                          notes/
   

   Check with ls -R.

4. Put a copy of TODO.txt into the notes directory (using cp).

5. Create a new text file data/notes/hints.txt and write any hints for possible rebel bases into this file.

6. Open notes/TODO.txt in your editor (e.g., atom) and add a note to item 1 too look in the hints.txt file. Save and exit.

7. Make a copy of your notes directory in your Documents/work directory:

    hw02-USERNAME/PHY494/01_shell/
                      Documents/
                                work/
                                     TODO.txt
                                     TODO.bak
                                     notes/
                                          TODO.txt
                                          hints.txt
                      data/
                          notes/
                                TODO.txt
                                hints.txt
   

8. Remove data/notes/hints.txt with rm.

9. Remove data/notes with rmdir. (Hint: Read the error message!)

10. Move work/notes/hints.txt into the work directory.

11. Remove the useless work/notes directory with rm -r (careful !)

After you completed the activity you should end up with a specific directory structure under ./hw02-USERBAME/PHY494/01_shell, which will be tested.

2.2 (OPTIONAL) "In the beginning was the command line"

(Skim)read Neal Stephenson’s In the Beginning... was the Command Line from 1999 (PDF). What are the advantages and disadvantages of using the command line instead of a graphical user interface?