1. Introduction

The module was created to synchronize the account database with another database (a flat file, whatever). This following tasks may be done.

• Create accounts when missing.
• Remove old accounts missing in the other database.
• Update various information of existing accounts.

Each task above is controlled independantly. So it is possible to use a file as a reference only to add account. If the file is known to hold all accounts, then it can be used as a reference to delete old Linux accounts.