Here's a quick example of how to run a Jenkins war file from the command line, DOS prompt or terminal window in Linux/Ubuntu. The short story? java -jar jenkins.war ...

If Java is not recognized as internal or external command, you need to make sure that the installation is not problematic and its path is recognized as system variables.

Get a hands-on look at Java preview features, such as the JDK 13 text blocks, with this video tutorial that lays out how to run and compile to proper code in five easy steps.