Cpio

archive

Cpio is a general file archiver utility and its associated file format, generally found in UNIX environments.

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• libarchiveOpen sourcereads and writes · 2-clause BSD License
• Apache TikaOpen sourcereads · Apache Software License 2.0
• Q215051Open sourcereads · GNU Lesser General Public License
• Archive Utilityreads
• B1 Free Archiverreads · proprietary license
• diffoscopereads

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Documentation

• kaitai grammar: https://github.com/kaitai-io/kaitai_struct_formats/blob/master/archive/cpio_old_le.ksy

Versions and variants (5)

• cpio, new ASCII variantUnknown
• cpio, new CRC variantUnknown
• cpio, old binary variant, big-endian encodingUnknown
• cpio, old binary variant, little-endian encodingUnknown
• cpio, portable ASCII variantUnknown

Sources

• File Formats Wiki
• Kaitai Struct: cpio_old_le
• PRONOM fmt/635
• Wikidata Q285296

From Just Solve the File Format Problem (File Formats Wiki), Kaitai Struct format gallery, PRONOM, Wikidata. Updated 2026-10-24.

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