how to open .jar file in linux.
Jar file is basically zip file, to see the content of .jar file we can use this command :
1. unzip jarfile.jar
2. jar xf jar-file
you can choose one between two options above to open .jar file in linux

source :
http://superuser.com/questions/417589/linux-what-is-a-most-convenient-way-to-see-the-content-of-jar-file
http://docs.oracle.com/javase/tutorial/deployment/jar/unpack.html