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AI / GitHub Copilot CLI Fundamentals Interview Questions

How do you install GitHub Copilot CLI?

Copilot CLI can be installed through several methods depending on your operating system and preferences.

Installation methods
MethodCommandOS
npm (recommended)npm install -g @github/copilotmacOS, Linux, Windows
Install script (root)curl -fsSL https://github.com/github/copilot-cli/releases/latest/download/install.sh | sudo bashmacOS, Linux
Install script (user)curl -fsSL https://github.com/github/copilot-cli/releases/latest/download/install.sh | bashmacOS, Linux
Homebrewbrew install gh-copilot (check docs for current formula)macOS
WinGetwinget install GitHub.CopilotCLIWindows
# npm installation (most common)
npm install -g @github/copilot

# Verify installation
copilot --version

# Install a specific version (using install script)
curl -fsSL .../install.sh | VERSION=1.2.3 bash

# Install to a custom directory (using install script)
curl -fsSL .../install.sh | PREFIX=$HOME/.local bash
# Installs to $HOME/.local/bin/

Install script options: The shell install script supports VERSION to pin a specific version and PREFIX to change the install directory. By default it installs to /usr/local/bin/ when run as root, or $HOME/.local/bin/ when run as a non-root user.

What is the npm command to install GitHub Copilot CLI globally?
What environment variable controls the install directory when using the Copilot CLI shell install script?

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What is GitHub Copilot CLI and how does it differ from the deprecated gh copilot extension? What are the prerequisites for installing GitHub Copilot CLI? How do you install GitHub Copilot CLI? How do you authenticate GitHub Copilot CLI and what token types are supported? What is the directory trust model in GitHub Copilot CLI and why does it exist? How do you start an interactive Copilot CLI session and what are the two main usage modes? What are slash commands in GitHub Copilot CLI and what are the most important ones? What are the operating modes in GitHub Copilot CLI and how do you switch between them? What is the copilot-instructions.md file and how does it affect Copilot CLI behaviour? How does model selection work in GitHub Copilot CLI? What is the /pr slash command in GitHub Copilot CLI and what can it do? What is the /fleet slash command and what problem does it solve? What is remote control in GitHub Copilot CLI and how does it work? What are Copilot CLI hooks and what can they be used for? What is the AGENTS.md file and how does it differ from copilot-instructions.md? What is the /chronicle slash command and what session history features does it provide? What is MCP (Model Context Protocol) support in Copilot CLI and how do you use it? What is the COPILOT_HOME environment variable and where does Copilot CLI store its config? What are experimental features in Copilot CLI and how do you enable them? What is AI Credits billing in GitHub Copilot CLI and how does it work? How does Copilot CLI read and understand repository context? What are the keyboard shortcuts available in an interactive Copilot CLI session? What is the difference between GitHub Copilot CLI and Copilot in VS Code? What is GitHub Copilot Workspace and how does it differ from Copilot CLI? What are common Copilot CLI troubleshooting steps and how do you debug issues? How does Copilot CLI differ between Copilot Individual, Business, and Enterprise plans? How do you use Copilot CLI effectively with private repositories? What are best practices for writing effective prompts in GitHub Copilot CLI? How can you use GitHub Copilot CLI in CI/CD pipelines and automation workflows? What security considerations should developers be aware of when using GitHub Copilot CLI? What is the --delegate flag and how does the /delegate slash command work? What logging and diagnostic capabilities does GitHub Copilot CLI provide? What does GitHub Copilot CLI's diff and undo capability provide? What are the Windows-specific considerations for GitHub Copilot CLI? What is the full list of GitHub Copilot CLI command-line flags and their purposes? How does GitHub Copilot CLI integrate with GitHub issues? What are the key differences when using Copilot CLI on macOS vs Linux? What is the overall workflow for using Copilot CLI on a real development task from start to finish?
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