built-in command
Computing term for a command that is integrated into a system, shell, or application, as opposed to an external or user-defined command.
Shell built-in commands execute faster than external programs.
このエディタには多くの組み込みコマンドが用意されている。
This editor provides many built-in commands.
Compound of 組み込み (built-in, from 組み込む 'to incorporate') and コマンド (command, from English).