Cpio
From Just Solve the File Format Problem
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| − | '''cpio''' is a non-compressed file archive format for [[Unix]]-style systems. It was originally intended for tape archiving, similar to the [[Tape Archive]] (tar) format. | + | '''cpio''' is a non-compressed file archive format for [[Unix]]-style systems. It was originally intended for tape archiving, similar to the [[Tape Archive]] (tar) format. |
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| + | In [[Linux]] cpio archive can readily be found in <code>/boot</code> as filename <code>/boot/initramfs*.img</code> for kernel versions 2.6 and onwards.<ref>[[wikipedia:cpio|cpio on Wikipedia]]</ref><ref>[https://www.kernel.org/doc/html/latest/driver-api/early-userspace/early_userspace_support.html Early userspace support - kernel documentation]</ref> Alternatively, cpio archives are used as [[RPM]] packages. | ||
== Examples == | == Examples == | ||
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* [[Konvertor]] | * [[Konvertor]] | ||
* {{Deark}} | * {{Deark}} | ||
| + | * [[tar#software|star]] | ||
== Sample files == | == Sample files == | ||
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* [http://rightsock.com/~kjw/Ramblings/tar_v_cpio.html tar vs. cpio] | * [http://rightsock.com/~kjw/Ramblings/tar_v_cpio.html tar vs. cpio] | ||
* [https://web.archive.org/web/20190809160054/http://www.forensicswiki.org/wiki/Cpio ForensicsWiki entry] (no useful detail) | * [https://web.archive.org/web/20190809160054/http://www.forensicswiki.org/wiki/Cpio ForensicsWiki entry] (no useful detail) | ||
| + | |||
| + | == References == | ||
| + | <references/> | ||
Revision as of 00:30, 12 August 2025
cpio is a non-compressed file archive format for Unix-style systems. It was originally intended for tape archiving, similar to the Tape Archive (tar) format.
In Linux cpio archive can readily be found in /boot as filename /boot/initramfs*.img for kernel versions 2.6 and onwards.[1][2] Alternatively, cpio archives are used as RPM packages.
Contents |
Examples
To extract files, using the command line utility:
$ cpio -idmv -I example.cpio
To list files:
$ cpio -it -I example.cpio
Identification
A cpio archive begins with one of the following signatures:
-
0x71 0xC7 -
0xC7 0x71 -
'0' '7' '0' '7'
Be aware that there are afio extensions to cpio format that are not supported by most cpio utilities. For one thing, if most of the filenames end in ".z", it's probably a compressed afio archive.
Specifications
Software
Sample files
- http://ftp.gnu.org/gnu/tar/tar-1.27.cpio.gz
- dexvert samples — archive/cpio
- ClamAV Download → 0.103.8 Source → test/.split → split.clam.*.cpio??
Other links
- Wikipedia article
- cpio utility man page
- GNU cpio manual
- tar vs. cpio
- ForensicsWiki entry (no useful detail)
