Working with the Unix Shell 1

Exercise 0. (20 points)

• Start the Vim tutorial
• Start emacs and enter C-h t to start the tutorial.

When you have completed each tutorial, declare “I have completed the (vi|emacs) tutorial below” for 10 points each.

Exercise 1. List the folders and files in your home directory, including hidden files. (5 points)

Exercise 2.1. Create the following empty file: ~/turtle/turtle/turrtle/all_the_way_down.txt (5 points)

Exercise 2.2. Using only Unix shell commands, put the following text into the empty file created in Exercise 2.1 (5 points)

One, two,
Buckle my shoe;
Three, four,
Knock at the door;
Five, six,
Pick up sticks;
Seven, eight,
Lay them straight:
Nine, ten,
A big fat hen;

Source

Exercise 2.3: Append the following lines to the same file. (5 points)

Eleven, twelve,
Dig and delve;
Thirteen, fourteen,
Maids a-courting;
Fifteen, sixteen,
Maids in the kitchen;
Seventeen, eighteen,
Maids in waiting
Nineteen, twenty,
My plate's empty.

Exercise 2.4. Print ONLY the date and time the file ~/turtle/turtle/turrtle/all_the_way_down.txt was last modified. (10 points)

Exercise 2.5. Replace all occurrences of the lower case vowels “aeiou” in ~/turtle/turtle/turrtle/all_the_way_down.txt with the equivalent upper case vowel. (10 points)

Exercise 2.6. Delete the directory ~/turtle and all its sub-directories and files. (5 points)

Exercise 3. Find all files in the current directory with the word “buckle” (case insensitive) and print their names. (5 points)

Exercise 4. Download the following file https://archive.ics.uci.edu/ml/machine-learning-databases/iris/iris.data into a file iris.csv'. Create a new fileiris24.csvcontaining just columsn 2 and 4 ofiris.csv`. (10 points)

Exercise 5. Using emasc or vi (we trust your honesty not to use any other editor), write a bash shell script that finds the average of all numbers in a file that has only 1 column of numbers. Using the script, find the average of the 3rd column of iris.csv. (20 points)