GlossaryCommand Line Interface (CLI)

Command Line Interface (CLI)

A command line interface (CLI) is a text-based tool that lets users control a computer system or application by typing commands in a terminal.

Table of Contents

Table of Contents

What Does Command Line Interface (CLI) Mean?

A command line interface (CLI) is a text-based tool for interacting with a computer system by typing commands. Developers and operators use a terminal instead of a graphical interface.

Common actions include configuring systems, running scripts, and managing resources.

CLI vs. GUI

Aspect CLI GUI
Interaction Typed commands Clicks and visual controls
Speed for experts Very fast Slower for repetitive tasks
Automation Easy to script Hard to automate
Learning curve Steeper Gentler
Best for Automation, pipelines, precise control Exploration and visualization

Why CLIs Matter for Developers

  • Efficiency: tasks run with a single command or script
  • Automation: repetitive workflows become scripts
  • Precision: exact control over complex operations
  • Portability: works across operating systems and environments
  • Pipeline-friendly: CI/CD jobs call CLI commands directly

Common Uses of a CLI

  • Build and deploy: run build, deployment, and test commands
  • File management: navigate and manage files and directories
  • Scripting: automate workflows with shell scripts
  • Cloud and APIs: interact with cloud services and APIs
  • Infrastructure: manage tools like Kubernetes and Docker

Real-World Examples

  • Git: developers clone, commit, and push code
  • kubectl: DevOps engineers manage Kubernetes resources
  • AWS CLI and Azure CLI: cloud admins deploy and configure infrastructure
  • Testkube CLI: a B2B SaaS QA team triggers test workflows from scripts and pipelines

Here is what running a Testkube workflow from the terminal looks like:

# list available test workflows
testkube get testworkflows

# run a workflow and follow its logs
testkube run testworkflow checkout-api-tests -f

How the CLI Works with Testkube

The Testkube CLI connects terminals and pipelines to testing in Kubernetes. Users can:

  • Manage tests: create, run, and manage tests in Kubernetes clusters
  • Trigger workflows: start functional, load, and integration test workflows
  • Follow results: stream logs and see outcomes in real time
  • Configure without a UI: set up workflows straight from the terminal
  • Automate: call the CLI from CI/CD pipelines or local scripts

Best Practices for Using a CLI in Testing

  • Script common tasks: turn frequent commands into reusable scripts
  • Use tokens in pipelines: authenticate with scoped API tokens, not personal logins
  • Pin versions: keep CLI versions consistent across machines and runners
  • Follow logs on failure: stream output to debug faster
  • Pair with a dashboard: use the CLI to act and the UI to explore trends

Frequently Asked Questions (FAQs)

What is the advantage of using a CLI over a UI?

A CLI gives faster, scriptable control. A UI is easier for visualization and navigation, so many teams use both.

Can Testkube tests be triggered from the CLI?

Yes. The Testkube CLI runs tests and workflows directly inside Kubernetes clusters.

Is the Testkube CLI cross-platform?

Yes. It installs on macOS, Linux, and Windows.

How does the CLI integrate with CI/CD pipelines?

Pipeline steps call the CLI to trigger tests, fetch results, and manage workflows automatically.

Can the CLI replace the Testkube dashboard?

Not entirely. The CLI suits direct control and automation, while the dashboard provides visualization and insights.

Related Terms and Concepts

CI/CD Integration

CI/CD integration is the practice of building automated tests into continuous integration and delivery pipelines so every code change is validated before it ships.
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Kubernetes

Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications across clusters of machines.
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API Testing

API testing validates that application programming interfaces return correct responses, perform under load, and enforce security, authentication, and data format rules.
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