adduser

About adduser

From Debian's package description

This package includes the 'adduser' and 'deluser' commands for creating and removing users.

• 'adduser' creates new users and groups and adds existing users to existing groups;
• 'deluser' removes users and groups and removes users from a given group.

Adding users with 'adduser' is much easier than adding them manually. 'Adduser' will choose UID and GID values that conform to Debian policy, create a home directory, copy skeletal user configuration, and automate setting initial values for the user's password, real name and so on.

'Deluser' can back up and remove users' home directories and mail spool or all the files they own on the system.

A custom script can be executed after each of the commands.

'Adduser' and 'Deluser' are intended to be used by the local administrator in lieu of the tools from the 'useradd' suite, and they provide support for easy use from Debian package maintainer scripts, functioning as kind of a policy layer to make those scripts easier and more stable to write and maintain.

From Debian's description of the adduser package, under that package's license.