The command line is not only powerful, it can also be dangerous. Learn how to use commands for deleting files and folders correctly to make sure your time with Terminal is a productivity godsend ...

We compiled the complete list of commands you can give to Amazon's Alexa on any of your Echo devices.

DCL - Data Control Language DCL (Data Control Language) includes commands such as GRANT and REVOKE which mainly deal with the rights, permissions and other controls of the database system.

TCL is a set of commands used to manage transactions in a database. Transaction is a single unit of work that consists of one or more operations. A PostgreSQL transaction is atomic, consistent, ...