0 Prerequisites This skill 31 Unlocked

Skill · Linux · Use a terminal

Run commands and read their output in a shell

Open a terminal, run a command with its options and arguments, read its output, errors and exit code, redirect streams and find the built-in help.

Start lesson 1The Linux domain

• 6 lessons
• ~4 h 40 of reading
• 6 quizzes
• 0 proof lab

The path

Where it comes from, where it leads

What you need to know first, where you stand on this skill, and what it opens next. Your status is computed in your browser, from what you have read and passed.

Before · no prerequisite

A foundation skill: you can start right away.

This skill, for you

Run commands and read their output in a shell

Computing

It unlocks · 31 skills

• Access your cloud account and drive it from the command line
• Install, declare and troubleshoot a local cloud emulator, and point the official clients at it
• Install Ansible and configure its control node
• Consume a REST API reliably from a shell script
• Query and modify HCL files from a script, verifiably
• Format, validate and lint HCL files, in CI and locally
• Query structured output with JMESPath (AWS CLI, Azure CLI, Ansible)
• Validate JSON strictly and against a JSON Schema
• and 23 others

  • Query structured output with JSONPath, notably in kubectl
  • Automate SQL operations reliably and safely
  • Query and modify a YAML document reproducibly
  • Validate a YAML document with linting, schemas and automated checks
  • Understand and use Git history
  • Install Claude Code and drive a session on a project
  • Provision infrastructure with Pulumi in Python: project, stack, state, configuration and secrets
  • Initialise, run and troubleshoot a Terraform project, from init to destroy
  • Find your way around the tree and handle files and text from the command line
  • Set up a reproducible data science workstation: a pinned conda environment and a Jupyter notebook that runs end to end
  • Reason in layers and observe a network
  • Manipulate lists, tuples, sets and slices in Python
  • Persist data in Python with SQLAlchemy and version the schema with Alembic
  • Manage Python versions, dependencies and installed tools (pyenv, pipx, Poetry)
  • Model data in Go: structs, slices, maps and pointers
  • Write idiomatic Python: decorators, generators, context managers and itertools
  • Organize code into modules and publish a package on PyPI
  • Design Python classes: encapsulation, inheritance, abc and mixins
  • Process and generate text in Python: strings, regex, dates and Jinja templates
  • Build a terminal interface in Python with Rich and Textual
  • Model and type data in Python with dataclasses, Enum and annotations
  • Write a correct Rego policy in OPA 1.x syntax, and predict what it returns
  • Set up a hypervisor and check that it works

Lessons

How to learn it

6 lessons, about ~4 h 40, in program order. Each lesson ends with its quiz.

The program

6 lessons · ~4 h 40

Part 1 · Discover Linux 3 lessons · ~2 h 25

1. 1Open a terminal and understand the prompt· 45 min
2. 2Anatomy of a Linux command· 50 min
3. 3Getting help on Linux· 50 min

Part 2 · Find your way around the files 1 lesson · ~55 min

1. 4Absolute and relative paths on Linux· 55 min

Part 3 · Work with files and text 1 lesson · ~50 min

1. 5Redirections and pipes on Linux· 50 min

Part 4 · Users, permissions and processes 1 lesson · ~30 min

1. 6Use sudo: run a command as root· 30 min

Beyond the lessons

Assess, practise, pass the proof

Reading a lesson confirms nothing. A skill is confirmed by a passed quiz, practised in a guided lab, and put to the test by a challenge or a mission; an imported lab result is not verified by the site.

Assess yourself

6 quizzes

At the end of the lessons: passed at 70%, they confirm the skill.

Practice

5 guided labs

• First steps in the terminal
• Get help from the command line
• Absolute and relative paths
• Read and decode a command
• Redirect streams and chain commands with pipes

Proof

No proof

Neither a challenge nor a mission with a proof yet.

Around it

Who requires it, who teaches it

Required by

• RHCSA (EX200, RHEL 10)

In red: the certification it prepares for.

Taught by

• Linux Training

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