Operating Systems Lab — Module 1 Exercise List

Getting Started

Follow these steps before attempting any of the exercises below.

1. Install Git (if not already installed)

sudo apt update && sudo apt install -y git

To verify the installation:

git --version

2. Clone the Repository

git clone https://gitea.frevinnoh.dev/frevinnoh/sisop_module1_exercise.git

2. Move into the Lab Directory

cd sisop_module1_exercise

3. Explore the Structure

Take a moment to look around before you start:

ls -la

You should see the following directories and files:

archive/
config/
data/
logs/
maze/
scripts/
README.md

4. Answer the Questions

Work through the exercises in the table below. Some questions require you to create new files or scripts — save them in the locations specified. Do not delete or modify any provided files unless a question explicitly asks you to.

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Exercise List

#	Topic	Question
1	Navigation	Go to the sisop_module1_playground directory. List all files in config/, including hidden ones.
2	Permissions	Find the file archive/locked.txt. Change permissions so only the owner can read it.
3	Search	Find the line in logs/app.log containing "ERROR" and save it to logs/error_only.txt.
4	Count	How many files ending in .tmp exist in the data/ directory?
5	Chaining	List all files in data/ and sort them in reverse alphabetical order.
6	I/O Redirection	Create a file info.txt containing the current date and your username.
7	AWK	Print only the names (Column 2) of all users in data/users.csv.
8	AWK	In data/users.csv, find the total sum of salaries (Column 4).
9	AWK	Print the Name and Role of users who have a "Status" of "Active".
10	Bash	Create a script scripts/check_dir.sh that checks if a directory provided as an argument exists.
11	Bash	Fix scripts/hello.sh so it correctly prints the current date (it currently prints the word "date").
12	Bash	Write a loop in a script that creates 5 files named test_1.txt to test_5.txt.
13	Cron	Write a cron expression that runs scripts/hello.sh every day at 3:30 AM.
14	Cron	List all active cron jobs for the current user.
15	Wildcards	Delete all files in data/ that have the extension .bak.
16	Disk Usage	Check the total size of the sisop_module1_playground directory in human-readable format.
17	AWK	In data/users.csv, print the name of the person with the highest salary.
18	Sed	Replace every occurrence of "INFO" with "LOG" in logs/app.log (output to a new file).
19	Processes	Find the Process ID (PID) of your current bash session.
20	Archiving	Create a compressed .tar.gz archive of the entire logs/ directory.
21	Bash	Write a bash script that: (1) updates and upgrades the system using apt, (2) creates a directory called new_image/ if it does not already exist, and (3) downloads an image from a given URL and saves it into the new_image/ directory using wget or curl.
22	Search	Inside the maze/ directory there is a deeply nested file called secret.txt. Use a single command to find its full path, then display its contents.