cloc is a command-line tool that analyzes source code composition by counting blank lines, comment lines, and physical lines of code. It works with over 600 programming languages and provides detailed metrics for understanding code structure and documentation levels.

Key capabilities include:

Count individual files, entire directories, or compressed archives
Analyze specific git commits and repositories
Generate language-by-language breakdowns with file counts
Process multiple projects in batch operations
Support for Windows, macOS, and Linux environments

Available in multiple formats:

Standalone Windows executable (no dependencies)
Perl source code (requires Perl interpreter)
Docker image for containerized environments
Package manager installations for various operating systems

The tool provides structured output showing files, blank lines, comments, and code lines organized by programming language. This makes it valuable for code audits, project metrics, documentation assessment, and codebase analysis. Whether you're evaluating project complexity, tracking code quality metrics, or understanding repository composition, cloc delivers comprehensive statistics in seconds.