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常见格式
ZIP Archive - universal compression format developed by Phil Katz (1989) supporting multiple compression methods. Built into Windows, macOS, and Linux. Uses DEFLATE algorithm providing good compression (40-60% reduction) with fast processing. Supports file encryption, split archives, and compression levels. Maximum compatibility across all platforms and devices. Perfect for file sharing, email attachments, web downloads, and general-purpose compression. Industry standard with virtually universal software support including built-in OS tools, mobile apps, and command-line utilities.
RAR Archive - proprietary format by Eugene Roshal (1993) offering superior compression ratios (10-20% better than ZIP) through advanced algorithms. Popular on Windows with WinRAR software. Supports recovery records for damaged archive repair, solid compression for better ratios, strong AES encryption, and split archives up to 8 exabytes. Excellent for long-term storage, large file collections, and backup scenarios. Common in software distribution and file sharing communities. Requires WinRAR or compatible software (not built into most systems).
7-Zip Archive - open-source format by Igor Pavlov (1999) providing the best compression ratio available (20-40% better than ZIP, 10-15% better than RAR). Uses LZMA and LZMA2 algorithms with strong AES-256 encryption. Supports huge file sizes (16 exabytes), multiple compression methods, solid compression, and self-extracting archives. Free from licensing restrictions and patent concerns. Perfect for maximizing storage efficiency, software distribution, and backup archives where size matters. Requires 7-Zip or compatible software but offers exceptional space savings.
Unix Formats
TAR Archive - Tape Archive format from Unix (1979) bundling multiple files and directories into single file without compression. Preserves file permissions, ownership, timestamps, and symbolic links critical for Unix systems. Often combined with compression (TAR.GZ, TAR.BZ2, TAR.XZ) for efficient distribution. Standard format for Linux software packages, system backups, and cross-platform file transfer. Essential for maintaining Unix file attributes. Works with streaming operations enabling network transfers and piping. Foundation of Unix/Linux backup and distribution systems.
GZIP/TGZ - GNU zip compression format (1992) using DEFLATE algorithm, standard compression for Linux and Unix systems. TGZ is TAR archive compressed with GZIP. Fast compression and decompression with moderate ratios (50-70% reduction for text). Single-file compression commonly paired with TAR for multi-file archives. Universal on Unix/Linux systems with built-in 'gzip' command. Perfect for log files, text data, Linux software distribution, and web server compression. Streaming-friendly enabling on-the-fly compression. Industry standard for Unix file compression since the 1990s.
BZIP2/TBZ2 - block-sorting compression format by Julian Seward (1996) offering better compression than GZIP (10-15% smaller) at the cost of slower processing. TBZ2 is TAR archive compressed with BZIP2. Uses Burrows-Wheeler transform achieving excellent ratios on text and source code. Popular for software distribution where size matters more than speed. Common in Linux package repositories and source code archives. Ideal for archival storage, software releases, and situations prioritizing compression over speed. Standard tool on most Unix/Linux systems.
XZ/TXZ - modern compression format (2009) using LZMA2 algorithm providing excellent compression ratios approaching 7Z quality. TXZ is TAR archive compressed with XZ. Superior to GZIP and BZIP2 with ratios similar to 7Z but as single-file stream. Becoming the new standard for Linux distributions and software packages. Supports multi-threading for faster processing. Perfect for large archives, software distribution, and modern Linux systems. Smaller download sizes for software packages while maintaining fast decompression. Default compression for many current Linux distributions.
{format_tar_7z_desc}
{format_tar_bz_desc}
{format_tar_lz_desc}
{format_tar_lzma_desc}
{format_tar_lzo_desc}
{format_tar_z_desc}
TGZ - TAR archive compressed with GZIP compression. Combines TAR's file bundling with GZIP's compression in single extension (.tgz instead of .tar.gz). Standard format for Linux software distribution and source code packages. Maintains Unix file permissions and attributes while reducing size 50-70%. Fast compression and decompression speeds. Universal compatibility on Unix/Linux systems. Perfect for software releases, backup archives, and cross-platform file transfer. Abbreviated form of TAR.GZ with identical functionality and structure.
TBZ2 - TAR archive compressed with BZIP2 compression. Better compression than TGZ (10-15% smaller) but slower processing. Uses Burrows-Wheeler block sorting for excellent text compression. Common in Linux distributions and software packages where size is critical. Maintains Unix file permissions and attributes. Perfect for source code distribution, archival storage, and bandwidth-limited transfers. Abbreviated form of TAR.BZ2 with identical functionality. Standard format for Gentoo Linux packages and large software archives.
TXZ - TAR archive compressed with XZ (LZMA2) compression. Modern format offering best compression ratios for TAR archives (better than TGZ and TBZ2). Fast decompression despite high compression. Supports multi-threading for improved performance. Becoming standard for Linux distributions (Arch, Slackware use TXZ). Maintains Unix permissions and symbolic links. Perfect for large software packages, system backups, and efficient storage. Abbreviated form of TAR.XZ representing the future of Unix archive compression.
LZMA/TAR.LZMA - Lempel-Ziv-Markov chain Algorithm compression format (2001) offering excellent compression ratios. TAR.LZMA combines TAR archiving with LZMA compression. Predecessor to XZ format using similar algorithm but older container format. Better compression than GZIP and BZIP2 but superseded by XZ/LZMA2. Still encountered in older Linux distributions and legacy archives. Slower compression than GZIP but better ratios (similar to XZ). Modern systems prefer TAR.XZ over TAR.LZMA. Legacy format for accessing older compressed archives from 2000s era.
LZO/TAR.LZO - Lempel-Ziv-Oberhumer compression format prioritizing speed over compression ratio. TAR.LZO is TAR archive compressed with LZO. Extremely fast compression and decompression (faster than GZIP) with moderate ratios (30-50% reduction). Popular in real-time applications, live systems, and scenarios requiring instant decompression. Used by some Linux kernels and embedded systems. Common in backup solutions prioritizing speed. Perfect for temporary compression, live CD/USB systems, and high-speed data transfer. Trade-off: larger files than GZIP/BZIP2/XZ but much faster processing.
Z/TAR.Z - Unix compress format from 1985 using LZW (Lempel-Ziv-Welch) algorithm. TAR.Z is TAR archive compressed with compress command. Historical Unix compression format predating GZIP. Patent issues (until 2003) led to GZIP replacing it. Legacy format with poor compression by modern standards. Rarely used today except in very old Unix systems and historical archives. If you encounter .Z or .tar.Z files, convert to modern formats (TAR.GZ, TAR.XZ) for better compression and wider support. Important for accessing ancient Unix archives from 1980s-1990s.
专业格式
ISO Image - ISO 9660 disk image format containing exact sector-by-sector copy of optical media (CD/DVD/Blu-ray). Standard format for distributing operating systems, software installations, and bootable media. Can be mounted as virtual drive without physical disc. Contains complete filesystem including boot sectors, metadata, and file structures. Essential for Linux distributions, system recovery media, and software archives. Used by burning software, virtual machines, and media servers. Universal standard with support in all major operating systems for mounting and burning.
Cabinet Archive - Microsoft's compression format for Windows installers and system files. Used extensively in Windows setup packages, driver installations, and system updates. Supports multiple compression algorithms (DEFLATE, LZX, Quantum), split archives, and digital signatures. Built into Windows with native extraction support. Common in software distribution for Windows applications, particularly older installers and Microsoft products. Maintains Windows-specific attributes and can store multiple files with folder structures. Part of Windows since 1996.
AR Archive - Unix archiver format (1970s) originally for creating library archives (.a files). Simple format storing multiple files with basic metadata (filename, modification time, permissions). Used primarily for static libraries in Unix development (.a extension). Foundation format for DEB packages (Debian packages are AR archives containing control and data). Minimal compression support (none by default). Essential for Unix library management and Debian package structure. Standard tool 'ar' included on all Unix/Linux systems. Simple and reliable for static file collections.
Debian Package - software package format for Debian, Ubuntu, and derivative Linux distributions. Contains compiled software, installation scripts, configuration files, and dependency metadata. Used by APT package manager (apt, apt-get commands). Actually a special AR archive containing control files and data archives. Essential format for Debian-based Linux software distribution. Includes pre/post-installation scripts, version management, and dependency resolution. Standard packaging for thousands of Ubuntu/Debian applications. Can be inspected and extracted as regular archive.
RPM Package - Red Hat Package Manager format for Red Hat, Fedora, CentOS, SUSE, and derivative Linux distributions. Contains compiled software, installation metadata, scripts, and dependency information. Used by YUM and DNF package managers. Includes GPG signature support for security verification. Standard for Red Hat Enterprise Linux ecosystem. Supports pre/post-installation scriptlets, file verification, and rollback capabilities. Essential format for RHEL-based Linux software distribution. Can be extracted as archive to inspect contents without installation.
JAR档案 - 基于ZIP压缩的Java档案格式,用于打包Java应用程序。包含编译后的Java类(.class文件)、应用程序资源和清单元数据。Java应用程序和库的标准分发格式。支持数字签名以进行代码验证。可以是可执行的(带有Main-Class清单的可运行JAR文件)。非常适合Java应用程序部署、库分发和插件系统。与ZIP工具兼容,但包含Java特定功能。自1996年以来,Java开发和部署的基本格式。
ARJ Archive - legacy DOS compression format by Robert Jung (1991). Popular in DOS and early Windows era for its good compression ratio and ability to create multi-volume archives. Supports encryption, damage protection, and archive comments. Largely obsolete today, replaced by ZIP, RAR, and 7Z. Still encountered in legacy systems and old software archives. Requires ARJ or compatible decompression software. Historical format important for accessing old DOS/Windows archives from 1990s. Better converted to modern formats for long-term accessibility.
LHA档案 - 1988年开发的日本压缩格式(也称为LZH),在日本和Amiga用户中极为流行。使用LZSS和LZHUF压缩算法,提供良好的压缩比。1990年代日本软件分发中常见。支持档案头、目录结构和文件属性。遗留格式,现在大多被现代替代品取代。在复古计算、日本软件档案和Amiga社区中仍然可以遇到。提取需要LHA/LZH兼容软件。对于访问日本和Amiga软件档案非常重要。
CPIO Archive - Copy In/Out archive format from Unix (1970s) for creating file archives. Simpler than TAR, often used for system backups and initramfs/initrd creation. Standard format for Linux initial RAM disk images. Supports multiple formats (binary, ASCII, CRC). Better handling of special files and device nodes than TAR. Common in system administration, bootloader configurations, and kernel initrd images. Universal on Unix/Linux systems. Essential for system-level archiving and embedded Linux systems. Works well for streaming operations.
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常见问题
What is a CPIO file and why is it still used in Unix systems today?
A CPIO file is an archive format originating from early Unix systems, designed to store collections of files, directory structures, and metadata in a simple, sequential layout. Unlike ZIP or TAR, CPIO does not include built-in compression—it's purely a packaging format. Compression is typically applied externally through tools like gzip, bzip2, or xz, producing files such as .cpio.gz, .cpio.bz2, or .cpio.xz.
CPIO is historically important because it was built into the original Unix System V toolchain and became foundational for installer payloads, boot images, and system recovery utilities. Its predictable structure and portability kept it relevant even as newer archive formats emerged.
Today CPIO remains heavily used in Linux initramfs images, RPM package internals, firmware distributions, and enterprise deployment systems where small, strict, metadata-preserving archives are preferred over more complex formats.
Why is CPIO commonly used inside Linux initramfs images?
CPIO可以在启动时直接流入内存,使其非常适合initramfs,它必须快速加载小型根文件系统,而不依赖外部工具。
由于该格式简单且线性,内核可以用最少的代码解压缩,从而减少复杂性和早期启动时的攻击面。
CPIO保持精确的文件权限、符号链接和所有权——这些对于需要精确元数据以启动系统的启动环境至关重要。
为什么CPIO没有内置压缩?
CPIO的创建早于压缩成为归档的标准要求,因此其设计者专注于元数据和结构的保留,而不是减少文件大小。
Unix philosophy favored separation of responsibilities; compression was left to external tools such as compress, gzip, and later bzip2 or xz.
这种分离允许开发人员选择适合其需求的压缩算法,而无需更改归档的内部结构。
为什么一些CPIO文件无法正确提取?
CPIO有几种格式变体(binary、old ASCII、new ASCII、CRC、SVR4),并非所有提取工具都能平等支持它们。使用错误的模式可能会导致头部解析问题。
压缩的CPIO档案中的损坏——尤其是.cpio.xz或.cpio.gz——可能会在提取开始之前破坏解压缩层。
Improperly generated archives, including mismatched file lengths or incorrect headers, may fail to extract on strict Unix utilities even if some tools accept them.
为什么在某些企业打包系统中更喜欢CPIO而不是TAR?
CPIO的线性结构和可预测的元数据处理使得自动构建工具更容易以编程方式生成和读取档案。
RPM包历史上使用CPIO作为其归档负载,因为其基于记录的结构使得依赖元数据和提取更简单。
其确定性布局在需要可重现构建或一致的逐字打包输出的系统中受到重视。
CPIO对敏感档案需求安全吗?
CPIO本身不提供加密、认证或完整性机制——它完全依赖于外部压缩包装或安全层。
档案可能会被篡改,除非包装在GPG签名的RPM结构或加密容器中。
对于安全使用,请使用 GPG 加密 CPIO 文件或将其嵌入加密保护的包中,而不是仅依赖于格式本身。
为什么提取 CPIO 存档有时会覆盖系统文件?
CPIO 像 TAR 一样,准确恢复存档中存储的完整路径。如果包含绝对路径或系统目录,它们会在没有提示的情况下被替换。
较旧的 CPIO 变体缺乏现代安全功能,如路径清理或覆盖保护。
为了避免覆盖重要的系统文件,请始终将 CPIO 存档提取到隔离目录中,或使用限制路径解析的标志。
Why do Linux developers still generate CPIO archives manually?
Many Linux boot and installer systems depend on CPIO for initramfs generation, making it essential for kernel development, embedded devices, and bootloaders.
其严格的设计确保了可预测的结果,这对于构建低级系统组件是必要的。
由于格式非常简单,开发人员可以仅使用 shell 脚本构建 CPIO 存档,而无需复杂的库。
损坏的 CPIO 存档可以修复吗?
轻微损坏有时可以通过宽松的提取器绕过,但 CPIO 缺乏恢复记录,使深度修复变得困难。
如果只有压缩层损坏,解压后有时可以部分恢复。
严重的头部损坏通常会使整个流变得不可读,因为该格式的顺序特性。
为什么某些 CPIO 文件会产生 '格式错误的头部' 错误?
存档可能使用提取工具不支持的变体,例如二进制与 newc ASCII 格式。
一些构建脚本意外生成零长度文件或不正确的文件大小字段,导致解析失败。
错误地压缩已经压缩的 CPIO 可能会导致残留数据,使解压缩器困惑。
为什么 CPIO 常见于固件转储和嵌入式系统?
Embedded Linux systems frequently use minimalistic root filesystems compressed into CPIO format due to its predictable unpacking behavior.
硬件供应商选择 CPIO,因为它消除了早期启动固件中对复杂解压缩工具的需求。
它允许将内核映像、脚本和基础系统文件组合成一个单一的包,便于引导加载程序使用。
为什么某些提取器在 CPIO 存档中显示截断的文件名?
较旧的 CPIO 格式有严格的文件名长度限制,现代系统在提取时可能仍会强制执行这些限制。
编码不匹配——尤其是在 ASCII 存档和 UTF-8 系统之间——可能导致文件名损坏。
一些存档是由早于现代文件系统约定的遗留工具生成的。
CPIO 在现代工作流程中与 TAR 相比如何?
TAR 更广泛地被用于一般归档,而 CPIO 主要在系统级和构建管道角色中持续存在。
在自动化环境中,CPIO 提供更可预测的输出,而 TAR 则提供更广泛的兼容性和功能。
对于大多数面向用户的任务,TAR 更受欢迎,但对于 initramfs、RPM 负载和可重复构建系统,CPIO 仍然表现出色。
CPIO 过时了吗?
While old, CPIO remains actively used in Linux internals and enterprise systems, meaning it’s not obsolete within those domains.
它的简单性、确定性输出和兼容性使其在启动过程和系统打包中难以被替代。
然而,对于日常归档,现代格式如 TAR、ZIP 或 7Z 更为实用。
在现代工作流程中应该使用 CPIO 吗?
Use CPIO when building initramfs images, working with RPM payloads, or interacting with embedded Linux environments.
它在可重复构建和基于脚本的简单存档创建中也很有用。
对于通用压缩或跨平台文件共享,请选择 TAR、ZIP 或 7Z。