Command Line Interfaces (CLI)
A command-line interfaces (CLI) is an application that processes text-based commands, typically entered into a terminal or executed via a shell script.
Deeper Knowledge on Command-line Interfaces (CLI)

Kubernetes CLI: kubectl
The CLI interface for Kubernetes

Markdown: Detect Broken links
Use markdown-link-check and Bash to detect broken links

jq
A portable CLI to slice, filter, and map JSON data

Git
A distributed version-control system to track changes, typically for software development projects

Angular CLI
Learn Angular
Broader Topics Related to Command-line Interfaces (CLI)

Shells
Shells process text based commands

Terminals
Terminals are text-based applications read and write to a shell