Interesting. I'll have to parse (heh) your comment, but for now, can say that IIRC, environment variables, command line options, and one other thing (maybe conf

Interesting. I'll have to parse (heh) your comment, but for now, can say that IIRC, environment variables, command line options, and one other thing (maybe config or .*rc - for Run Command - files, such as .exrc, .vimrc, .bashrc) are supposed to form a hierarchy, such that A can override B can override C (something like global and local CSS styles). And out of two of them at least, command-line options can override the values of environment variables, maybe since they can be changed more easily on a per-command-invocation basis.