Learn how to use the Command pattern to encapsulate requests as objects that you can execute alone or in sequence in your Java programs.

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 ...

But these aforementioned Java command-line tools -- namely, javac, javap, jstat, jdeps and jar -- are the five that serious software developers need to know.