V字龍 (Vdragon) says to Ubuntu 台灣社群參閱 GNU Bash 使用手冊 > Basic Shell Features > Executing Commands > Environment 章節的說明: The environment for any simple command or function may be augmented temporarily by prefixing it with parameter assignments, as described in Shell Parameters. These assignment statements affect only the environment seen by that command. https://www.gnu.org/software/bash/manual/bash.html#Shell-Parametersat Wed, Jan 22, 2020 3:11 PM