PROJECT_DIR 을 /home/labex/project 를 가리키는 환경 변수로 정의하는 줄은 무엇인가요?
PROJECT_DIR
/home/labex/project
echo PROJECT_DIR=/home/labex/project
export PROJECT_DIR=/home/labex
PROJECT_DIR=/home/labex/project
export PROJECT_DIR=/home/labex/project