apt-cdrom --version (return code: 0)
apt 1.2.19 (amd64)
apt-cdrom --help (return code: 0)
apt 1.2.19 (amd64) Usage: apt-cdrom [options] command apt-cdrom is used to add CDROM's, USB flashdrives and other removable media types as package sources to APT. The mount point and device information is taken from apt.conf(5), udev(7) and fstab(5). Most used commands: add - Add a CDROM ident - Report the identity of a CDROM See apt-cdrom(8) for more information about the available commands. Configuration options and syntax is detailed in apt.conf(5). Information about how to configure sources can be found in sources.list(5). Package and version choices can be expressed via apt_preferences(5). Security details are available in apt-secure(8).