This question is in reference to Atlassian Documentation: Installing Crucible on Linux and Mac
According to the documentation this is seems to prevent from doing this as the same variable name is pointing to two different locations. Or am I reading this wrong?
FishEye DOC: FISHEYE_INST="path/to/<FishEye instance directory>"
Crucible DOC: FISHEYE_INST="path/to/<Crucible instance directory>"
Or can they just share a FISHEYE_INST directory?
Ok, I didn't understand your problem correctly.
I though that you want to install many FishEye or Crucible applications (totally separated). In this case FISHEYE_INST cannot be shared because one application will override another's data.
But, I understand that you want to have Fisheye and Crucible running together.
FishEye and Crucible are bundled together. Each of them is activated when you provide license for it. It doesn't matter which app you start.
Pick one of them, start and add license for both products into same instance.