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プロジェクトリンク

• ホームページ
• パッケージマネージャページ

コマンドとエイリアス

• zip
• zipcloak
• zipnote
• zipsplit

プロジェクトの歴史

ZIP as a file format originated with PKWARE. The Library of Congress format description identifies ZIP as a cross-platform storage and transfer format, developed and maintained by PKWARE, and notes Phil Katz as the original developer of the format. PKWARE's APPNOTE specification says the format has been publicly specified since 1989 and remains maintained for interoperability.

Info-ZIP formed in 1990 as an Internet-based workgroup and mailing list. Its stated purpose was to provide free, portable Zip and UnZip utilities compatible with PKWARE's DOS-based tools. The official Zip page emphasizes portability beyond MS-DOS and the ability to run on many operating systems.

Info-ZIP Zip developed into the portable command-line counterpart to a format that had already escaped any one vendor. The project's own pages document releases across the 1990s and 2000s, including Zip 2.1 in 1996, Zip 2.2 in 1997, Zip 2.3 in 1999, Zip 2.32 in 2006, and Zip 3.0 in 2008.

採用の歴史

Info-ZIP's adoption story is one of portability. The project says it supports hardware from microcomputers to Cray systems and operating systems including Unix, VMS, OS/2, Windows, MS-DOS, classic Mac OS, AmigaDOS, Atari TOS, MVS, VM/CMS, Tandem NSK, and others. That breadth made `zip` and `unzip` natural baseline tools in Unix-like package collections.

The ZIP format became a container substrate for other ecosystems. The Library of Congress notes adoption as the package/container for Office Open XML, OpenDocument, and EPUB, while PKWARE's APPNOTE lists common ZIP-based extensions such as JAR, WAR, DOCX, XLSX, PPTX, ODT, ODS, and ODP.

Info-ZIP code also spread into third-party software. The project page describes uses in IBM products, Sun's HotJava distribution, Novell NetWare installation, Windows products such as WinZip and DynaZIP DLLs, PGP, and the zlib compression library lineage.

使われ方

`zip` packages files or directory trees into a ZIP archive, with metadata such as names, paths, timestamps, protection bits, and integrity checks. It is used for software distribution, archiving, temporary compression, source release bundles, build artifacts, and portable file exchange.

The Info-ZIP implementation has historically mattered on Unix-like systems because it behaves like a scriptable CLI. The official page calls out features such as creating archives in a pipe or on a device, text-format conversion across Unix/MS-DOS/Macintosh conventions, and broad OS support.

パッケージ好きにとっての重要性

`zip` is package-nerd bedrock: one of the commands you expect to exist before you know what the project is doing. It is simultaneously an end-user archive tool, a build artifact producer, and a compatibility bridge to formats that are ZIP files wearing application-specific extensions.

It also illustrates how packaging ecosystems preserve old interoperability contracts. A modern package manager carrying Info-ZIP is carrying a 1990s portability project, a 1989 archive specification, and the everyday ability to inspect or create archives used by Java, office suites, EPUB tooling, app bundles, and release pipelines.

タイムライン

• 1989: PKWARE begins public ZIP format specification through APPNOTE.
• 1990: Info-ZIP forms as an Internet mailing-list workgroup.
• 1993: PKWARE APPNOTE 2.0 introduces Deflate, later the default method used by most ZIP-compatible programs.
• 1996: Info-ZIP releases Zip 2.1 and UnZip 5.2.
• 1999: Info-ZIP releases Zip 2.3 under a BSD/X11-like license.
• 2008: Info-ZIP releases Zip 3.0 with large-file, ZIP64-scale archive, multipart, UTF-8 filename, and bzip2 support.

Related projects

• PKWARE PKZIP and APPNOTE, the original ZIP format lineage.
• Info-ZIP UnZip, the companion extractor package.
• zlib, whose deflate implementation lineage is closely tied to Info-ZIP contributors and became a core compression library.
• gzip, 7-Zip, libarchive, minizip, Java JAR/WAR tooling, Office Open XML, OpenDocument, and EPUB.

ソース

• https://infozip.sourceforge.net/
• https://infozip.sourceforge.net/Info-ZIP2.html
• https://infozip.sourceforge.net/Zip.html
• https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
• https://www.loc.gov/preservation/digital/formats/fdd/fdd000354.shtml