C:\apps\NetLogo 5.0\extensions\myextension\build\classes>jar cvfm ..\..\..\ myextension.jar ..\..\..\MANIFEST.MF *.class

1    2      3                           4                      5
jar  cvfm   ..\..\..\ myextension.jar   ..\..\..\MANIFEST.MF   *.class

1- jar
2- options
3- where to put the target jar file (up some way in the file hierarchy)
4- where to find the manifest file (up some way in the file hierarchy)
5- all class files