If you want to customise the HEPiX scripts for a single machine, consider
all the files under /etc/hepix
, as belonging to you.
It is these files and these files alone that you should customise. You should
understand what they do, in which order they are executed and what changes are
allowed.
These files are not overwritten by any installation procedure. They are your files and you simply must know that they are executed and what you must put in what file.