When using the Hudson CLI (with the server configured to use the ActiveDirectory plugin for authentication, the following syntax CLI command results in an error as shown below:

command tried:
java -jar hudson-cli.jar -s http://<hudson_server>/ login --username <my_admin_login> --password <my_admin_password>

results in:
"--username=<my_admin_login>" is not a valid option
java -jar hudson-cli.jar login args...
Saves the current credential to allow future commands to run without explicit credential information

Apparently, this bug in the LDAP authenticator has already been resolved, but still seeing this behavior in the ActiveDirectory plugin: http://issues.jenkins-ci.org/browse/JENKINS-6628?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel
Supposedly, extending AbstractPasswordBasedAuthentication in the security realm class should fix it.