Mostly doing this article as a note for the correct way to install java jdk or runtime for kali or debian wheezy.
Download either the jdk or jre tar.gz package from oracle
Install the java-package from debian
apt-get install java-package
You might also want to see my article Installing JTR On Backtrack for Multiprocessor Cores
I am too lazy to restore the old version of this file from my old website (it was hosted for years on mambo and I am just too lazy to do the db conversion). Anyways, this website serves a couple of purposes, first is to keep some of my own notes handy and second to help others. With that in mind, here is a collection of tips on using john the ripper:
Prepare Linux Shadow Passwords
umask 077 ./unshadow /etc/passwd /etc/shadow > mypasswds