printroot(8)

NAME
     printroot - print the name of the root device on standard output

SYNOPSIS
     printroot

OPTIONS

     -r   Print only the root device, not a full mtab line

EXAMPLES

     printroot           # Print the name of the root device

DESCRIPTION

     Printroot is useful for initializing the /etc/mtab  when  the  system  is
     booted.   It  figures out what the root device is by searching /dev until
     it finds a block special file with the right major/minor device numbers.

SEE ALSO
     fstab(5), boot(8).