Use Tools | Create Command-line Launcher, then run it from the Terminal.

imported a maven project with below command:

idea pom.xml <---- This is the Command line tool provided by Intellij guys

If you use spring boot and want to open from the terminal maven project its easy.

1. Open intellij
2. Navigate to Tools /Command Line Launcher
3. Add the default path - Just OK
4. Close the IDE
5. CD to the project from the terminal
6. type $ idea pom.xml

​​https://www.youtube.com/watch?v=SVANj3gAWt8​​