Pack, unpack and provide information about Debian archives. More information: https://manpages.debian.org/latest/dpkg/dpkg-deb.html.
dpkg-deb --info path/to/file.deb
dpkg-deb --show path/to/file.deb
dpkg-deb --contents path/to/file.deb
dpkg-deb --extract path/to/file.deb path/to/directory
dpkg-deb --build path/to/directory