Default [Q] New to samsung flashing, galaxy tab question

I have a Gt-3113. I can successfully boot into download mode and recovery mode, but that's it. I used Heimdall to put CWM recovery on it, but it won't boot any further, just to the splash screen. All the help threads say to use Odin, but I don't have windows, so they have been unhelpful. How can I push a factory image back to it to get it back to stock? Not a noob by any means, but this one is stumping me and I have been flashing for years...