absolute path Directions provided to a file or directory from the root directory.
access control lists ACLs are used to grant permissions to specific users or groups.
Active Directory A Microsoft Windows product based on the LDAP protocol. Designed to store information and provide this data for various purposes, such as user authentication.
active FTP mode In this mode, the FTP server initiates the data connection.
alias A shell feature that allows a collection of commands to be executed by issuing a single “command.”
Amanda A third-party backup utility.
anonymous FTP An FTP feature where a special account (anonymous or ftp) can be used to connect to an FTP server without the need of a password or access to a local user account.