bzip2 を Homebrew でインストール

プロジェクトリンク

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コマンドとエイリアス

• bunzip2
• bzcat
• bzcmp
• bzdiff
• bzegrep
• bzfgrep
• bzgrep
• bzip2
• bzip2recover
• bzless
• bzmore

プロジェクトの歴史

The official bzip2 manual identifies Julian Seward as author and gives the 1.0.8 manual release date as 13 July 2019, with copyright running from 1996 through 2019. The Sourceware home page describes bzip2 as a freely available, patent-free, high-quality data compressor organized as both a command-line program and a library.

Technically, bzip2 uses block-sorting compression associated with the Burrows-Wheeler transform, followed by entropy coding. Its design favored compression ratio over speed, and the official site positions it as typically compressing close to much heavier statistical compressors while remaining practical on ordinary Unix systems.

The 1.0 line became the compatibility anchor for the `.bz2` format and libbzip2 API. Sourceware's git tags preserve older public milestones from `bzip2-0.1` through `bzip2-1.0.8`, showing a package with a slow, conservative release culture after its format became infrastructure.

採用の歴史

bzip2 adoption followed the familiar Unix pattern: first as a better-compressing alternative to gzip, then as a standard option in tar pipelines, release archives, Linux distributions, and package managers. The command names `bzip2`, `bunzip2`, and `bzcat` intentionally echo gzip's workflow, reducing friction for shell users.

The package's presence across Homebrew, Debian, Ubuntu, Fedora, Alpine, Arch, MacPorts, Nix, Chocolatey, Scoop, and openSUSE reflects near-universal distribution. Even where xz and zstd displaced it for many new archives, bzip2 remains installed because decades of `.bz2` artifacts still need reliable decompression.

使われ方

Users compress files with `bzip2`, decompress with `bunzip2`, stream with `bzcat`, compare or diff compressed files with `bzcmp` and `bzdiff`, and recover damaged block-based archives with `bzip2recover`.

Developers use libbzip2 when applications need to read or write `.bz2` streams directly. The official manual documents both the command interface and the programming interface, which is why package managers usually split runtime tools and development headers.

パッケージ好きにとっての重要性

bzip2 is package-nerd bedrock: it is one of the archive formats every build tool, mirror, bootstrap script, and source-fetching system eventually has to understand. A working `bunzip2` is boring until a historical tarball or distro source package requires it.

It is also a case study in conservative infrastructure. The compressor is no longer fashionable, but its stable format, simple commands, portable C implementation, and widespread packaging make it one of the quiet dependencies that keeps old source distribution workflows reproducible.

タイムライン

• 1996: Julian Seward's bzip2 copyright history begins.
• 1997: Early public tags such as `bzip2-0.1` appear in the official Sourceware git history.
• 2000: The 1.0 series establishes the long-lived format and library baseline.
• 2010: bzip2 1.0.6 becomes a widely packaged stable release.
• 2019: bzip2 1.0.8 is released and documented as the current stable version on Sourceware.

Related projects

• gzip is the older Unix compressor whose command-line conventions bzip2 intentionally resembles.
• xz, zstd, and lzip are common later alternatives in source distribution and package-manager ecosystems.
• libbzip2 is the library interface shipped with the command-line program for applications that need `.bz2` support.

ソース

• https://sourceware.org/bzip2/
• https://sourceware.org/bzip2/manual/manual.html
• https://sourceware.org/git/?p=bzip2.git;a=summary
• source_facts.package-manager