This section is from the "Version Control with Subversion" book, by Ben Collins-Sussman, Brian W. Fitzpatrick and C. Michael Pilato. Also available from Amazon: Version Control with Subversion.
--config-dirDIRInstructs Subversion to read configuration
information from the specified directory instead of the
default location (.subversion in
the user's home directory).
--no-auth-cachePrevents caching of authentication information (e.g. username and password) in the Subversion administrative directories.
--non-interactiveIn the case of an authentication failure, or insufficient credentials, prevents prompting for credentials (e.g. username or password). This is useful if you're running Subversion inside of an automated script and it's more appropriate to have Subversion fail than to prompt for more information.
--passwordPASSIndicates that you are providing your password for authentication on the command line—otherwise, if it is needed, Subversion will prompt you for it.
--usernameNAMEIndicates that you are providing your username for authentication on the command line—otherwise, if it is needed, Subversion will prompt you for it.