mknod(8)
Name
mknod − make special file
Syntax
/etc/mknod name [ c ] [ b ] major minor
/etc/mknod name p
Description
The mknod command makes a special file. The first argument is the name of the entry. The second is b if the special file is block-type (disks, tape) or c if it is character-type (other devices). The last two arguments are numbers specifying the major device type and the minor device (for example, unit, drive, or line number).
The assignment of major device numbers is specific to each system. These numbers are obtained from the system source file conf.c.
The mknod command can also be used to create fifo’s, also known as named pipes, (second case in the Syntax section above).