This CLI allows invoking various system activities for the purpose of generating and validating telemetry data. The following actions are supported:

• Process creation
• File creation, modification, and deletion
• Network activity

Each action taken is saved in JSON format within activity_log.jsonl.

The CLI was created using the Thor gem.

I chose JSONL as the format because I felt that was appropriate. Each line is a complete JSON object containing the command used and its details.

I created a docker-compose.yml file for testing this on linux. See the usage section below for how to use it.

Tests were written using Minitest in cli_test.rb. I was a bit loose on some of the assertions but given more time I would make the assertions more strict.

Install Ruby >= 3.2 on the target system. Then run the following command to install necessary libraries.

bundle install

To run locally use:

bundle exec activity-cli

To run commands within a local linux container use:

docker compose run --rm -workdir /app app bundle exec activity-cli

ruby cli_test.rb