Creates and reads several different streaming archive formats
Libarchive is a programming library that can create and read several different streaming archive formats, including most popular tar variants and several cpio formats. It can also write shar archives and read ISO9660 CDROM images. The bsdtar program is an implementation of tar(1) that is built on top of libarchive. It started as a test harness, but has grown and is now the standard system tar for FreeBSD 5 and 6.