Redox OS user and group utilities.

The userutils crate contains the utilities for dealing with users and groups in Redox OS. They are heavily influenced by UNIX and are, when needed, tailored to specific Redox use cases.

These implementations strive to be as simple as possible drawing particular inspiration by BSD systems. They are indeed small, by choice.

Currently included:

• getty: Used by init(8) to open and initialize the TTY line, read a login name and invoke login(1).
• id: Displays user identity.
• login: Allows users to login into the system
• passwd: Allows users to modify their passwords.
• su: Allows users to substitute identity.
• sudo: Enables users to execute a command as another user.
• useradd: Add a user
• groupadd: Add a user group
• whoami: Display effective user ID.