noun
external command
In computing, a command that is not built into the shell or operating system kernel, but is a separate program.
このシェルでは、外部コマンドを実行するときに新しいプロセスが生成される。
In this shell, a new process is created when an external command is executed.
An internal command is built into the shell, while an external command is a separate executable file.
Compound of 外部 (external) and コマンド (command), a straightforward technical term.