V4/man/man0/tocx8

.xx "20boot" "install new 11/20 system"
.xx "boot procedures" "UNIX startup"
.xx "check" "file system consistency check"
.xx "clri" "clear i-node"
.xx "df" "disk free"
.xx "ino" "get the i-number of a file"
.xx "mkfs" "construct a file system"
.xx "mknod" "build special file"
.xx "mount" "mount file system"
.xx "reloc" "relocate object files"
.xx "su" "become privileged user"
.xx "sync" "update the super block"
.xx "umount" "dismount file system"
.xx "update" "periodically update the super block"