Course directory website.
This is a markdown document (.md), a simple and easy-to-use markup language you can use to format most documents. You will be guided on how to use markdown while answering the prompts in this assignment, and you will find markdown especially useful for documenting your work in the future assignments (especially in Python or R). For now, use the VSCode editor (see course SetUp guide) to modify and complete the assignment, VSCode supports markdown files out of the box, and you can preview your markdown code with the rendered text side by side.
You will modify this file with your answers and submit your assignment in an email to xix2007@med.cornell.edu. The file should be saved as {first}-{last}-assignment{#}.md, and your email should be titled datascibasics assignment {#}.
Follow chapter 1’s exercise module steps and answer the following questions:
Explain in your own words, what the datascibasics script file you’ve created does when executed. Enter your answer in the markdown quoted block here:
Replace this line with your answer
According to the output error message and permissions you listed in step 6, why doesn’t your datascibasics script work?
Replace this line with your answer
When you ran the same script with sh in step 7, why did this work?
Answer here
In steps 8 and 9, what permission combination did you change your datascibasics file to? Copy and paste the chmod command you used, and show the permissions of your file in the code block here:
# The chmod command you used:
# New file permissions as displayed in your terminal:
what is the lowest numeric value your file permissions can have for the code to execute? What about the highest? Why do you think you should avoid giving the highest permissions to a script file (think on a shared machine, like a shared lab computer)?
Answer here
Use man again to check out what the cat program does, and use it to view your last-modified.txt file from the last step. When is the last time our course website was modified?
# Answer with your terminal output here:
The history program lists your command line history When you simply enter history into your terminal. The filtering options are different for bash and zsh. For bash, history 20 will display the last 20 commands used in your bash history, whereas history 1 20 in zsh displays the first 20 entries of your zsh history (You can use history -20 -1 to display the last 20 commands). Use history to do the following:
# Display the last 10 commands you used in your terminal:
# Use | and grep to display the commands that operates on your datascibasics file.
The history program also lists a line number with each command recorded in your history. Select the line number from the history you displayed in Q6a that executes your shell script, enter an ! in your terminal followed by the line number (!52 if your line number was 52), what happens?
Now, what if you wanted to recall and execute a command relative to our current position? For example, if our ./datascibasics execution was 5 commands ago, how do we use ! to use relative line numbers instead of absolute line numbers (hint: see the zsh instructions from part a)?
# Answer here