Instead , it made the directory with mknod and linked in the .
In early versions of Unix ( 4.1 BSD and early versions of System V ) , this command had to be setuid root as the kernel did not have an mkdir syscall .
It made the directory with mknod and linked in the .
In early versions of Unix ( 4.1 BSD and early versions of System V ) , this command had to be setuid root as the kernel did not have an mkdir syscall .