+ virtualization. <filename>systemd-detect-virt</filename>
+ exits with a return value of 0 (success) if a
+ virtualization technology is detected, and non-zero
+ (error) otherwise. By default any type of
+ virtualization is detected, and the options
+ <option>--container</option> and <option>--vm</option>
+ can be used to limit what types of virtualization are
+ detected.</para>