how to expand a .jar file

i tried jar -xv some_file.jar but it haltted without any output or expanded files.
and it seems to be waiting for some more input… i don’t know.

Try with jar -xvf some_file.jar

From your description (waiting for some more input…) i think you forgot to write
java -jar -options somejar.jar

Depending uppon software you have you can sometimes rename it to".zip" and expand it with a zip software like winzip or pkunzip

Bruno

many thanks to you!
it works as i expect with an f option