os-prober (1) - Linux Manuals
os-prober: Discover bootable partitions on the local system.
NAMEos-prober --- Discover bootable partitions on the local system.
The os-prober utility will scan all disks available on the system for other operating systems. For each discovered OS, it will output a line of the form:
<partition>:<descriptive name>:<short name>:<kind of loader>
For example, on system with Windows XP installed on /dev/sda1, os-prober will display:
Note that for Linux systems that are discovered, a call to linux-boot-prober may be required in order to fully discover the necessary information to boot the system.