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# Introduction

`bzip2` compresses files using the Burrows-Wheeler block-sorting text compression algorithm, and Huffman coding. Compression is generally considerably better than that achieved by more conventional LZ77/LZ78-based compressors, and approaches the performance of the PPM family of statistical compressors.

`bzip2` is built on top of `libbzip2`, a flexible library for handling compressed data in the `bzip2` format. This manual describes both how to use the program and how to work with the library interface. Most of the manual is devoted to this library, not the program, which is good news if your interest is only in the program.

Chapter 2 describes how to use `bzip2`; this is the only part you need to read if you just want to know how to operate the program. Chapter 3 describes the programming interfaces in detail, and Chapter 4 records some miscellaneous notes which I thought ought to be recorded somewhere.

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