Cpio

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.

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:

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

 * cpio format man page

Software

 * GNU cpio
 * libarchive / bsdcpio
 * cpio for Windows
 * 7-Zip
 * afio
 * Konvertor

Sample files

 * http://ftp.gnu.org/gnu/tar/tar-1.27.cpio.gz
 * https://telparia.com/fileFormatSamples/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)