runiq – filter duplicate lines from input

runiq is a command-line utility for removing duplicate lines from textual input. It offers several methods for identifying repeated records, allowing users to choose between performance, memory consumption and matching accuracy.

The program was developed as an optimisation of neek, with an emphasis on handling large amounts of input efficiently. Unlike utilities that rely on sorting, runiq can process unsorted data while retaining the first occurrence of each distinct line.

Different filtering strategies make it suitable for applications ranging from ordinary text processing to analysing large datasets where memory consumption is particularly important.

runiq can also be used as a library in other applications.

This is free and open source software.

Key Features

• Four filtering strategies: quick, simple, sorted and compact.
• Quick filtering stores precomputed hashes to reduce memory consumption while maintaining high throughput.
• Simple filtering uses a set to track previously encountered values, providing accurate duplicate detection.
• Sorted filtering detects consecutive duplicates with minimal memory overhead, similar to traditional uniq.
• Compact filtering uses a scalable Bloom filter to reduce memory requirements at the cost of possible false positives.
• Processes textual input without requiring a separate sorting operation when using the appropriate filter.
• Supports command-line operation and integration as a software library.

Website: github.com/whitfin/runiq
Support:
Developer: Isaac Whitfield
License: MIT License

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