xuniq is a Rust command-line utility for text-processing workflows. It’s designed for fast line deduplication and fits neatly into shell pipelines when you need a lightweight tool focused on speed and streaming input rather than sorting-based approaches.
This is free and open source software.
Key Features
- Removes duplicate lines from standard input and writes unique lines to standard output.
- Doesn’t require input to be sorted before processing.
- Preserves the first occurrence of each line as it appears in the input stream.
- Offers a
--capacityoption to set the expected number of lines. - Provides a
--safemode that uses exact string matching to avoid collisions, at the cost of higher memory use.
Website: github.com/lalitshankarch/xuniq
Support:
Developer: Lalit Shankar Chowdhury
License: MIT License

xuniq is written in Rust. Learn Rust with our recommended free books and free tutorials.
Related Software
| Alternatives to uniq | |
|---|---|
| runiq | An efficient way to filter duplicate lines from input, à la uniq |
| huniq | Removes duplicates from stdin using a hash table |
| nauniq | Non-adjacent uniq |
| semiuniq | Removes nearby repeated lines in a file |
| uq | Removes duplicate lines from the output, regardless of the order |
| zet | Perform set operations on files considered as sets of lines |
| anew | Adds new lines to files, skipping duplicates |
| anewer | Appends lines from stdin to a file if they don't already exist in the file |
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