If theab2admin command fails, the error message contains additional information besides Command failed. For example, it may also include path not found or invalid ID.
Workaround: If the message command failed is displayed, make sure that the operation failed. For example, if the command you submitted should have deleted a collection from the AnswerBook2 database, type the following command to verify that the collection is displayed in the database.
# ab2admin -o list