duff ☆

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Description:
Quickly find duplicates in a set of files from the command-line

Type: Formula | Latest Version: 0.5.2@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: System utilities

Tags: deduplication cli file-management system-utility hashing

Install: brew install duff

About:
Duff is a command-line utility designed to rapidly identify duplicate files within a specified set of files or directories. It works by comparing file hashes to find exact byte-for-byte matches, making it significantly faster than traditional tools like 'find' for large datasets. This efficiency makes it an ideal tool for system administrators and developers looking to reclaim disk space or organize their file systems.

Key Features:

High-speed duplicate detection using optimized hashing algorithms
Simple command-line interface with configurable output formats
Recursive directory scanning capabilities
Low memory footprint for processing large file sets

Use Cases:

Cleaning up duplicate files in large media libraries or backup directories
Verifying data integrity after file transfers or backups
Auditing development environments for redundant assets

Alternatives:

fdupes – fdupes is a widely used classic, while duff is often cited as being faster and more efficient on very large sets of files.
fslint – fslint is a more comprehensive suite of tools for finding various types of lint, including duplicates, whereas duff focuses exclusively on duplicate detection.

License: Zlib

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, arm64_monterey, arm64_big_sur, sonoma, ventura, monterey, big_sur, catalina, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2025 3:27pm		0	VERSION_BUMP	fa3ef95c
Sep 12, 2024 8:11am		0	VERSION_BUMP	3bc731ae