lsdev - list devices' major number allocations
$ lsdev
lsdev is a utility for displaying devices' major number allocations, for character and block devices both. It shows the allocated number and its family name per allocation.
/sys/kernel/chardev_major_allocs
- list of the major number allocations for character devices./sys/kernel/blockdev_major_allocs
- list of the major number allocations for block devices.$ lsdev