The command to add users to a machine.

The command (on RedHat Linux, others may have something similar) to display the current runtime configuration for my machine in various levels.

The command to create groups on a machine. A group should be added before any users who belong to the group are added.

These are a number of tools related to running daemons.

These are a number of tools related to running daemons.

These are tools related to dns.