JAVA_OPTS is not correct

**Hi everyone.**
**Could someone help, please?**
**I want to get "number =of users" from command line (Windows)**
**>gatling.bat JAVA_OPTS="-Dusers=5"**

And I Have a problem: Unknown argument 'JAVA_OPTS=-Dusers=5'

I have gatling 2.1.7

This is a windows question, not a Gatling question. Since I don’t use Windows, I can’t answer it, definitively. But to give you a clue so you can research it yourself, the part that says “JAVA_OPTS=” is intended to set an environment variable. Now, Google how to set an environment variable in Windows from the Command-Line.