>> Are there any flags, options, special environment variables, etc. >> that would prevent Cygwin from making any registry changes?
> You can prevent this with the '--no-write-registry' setup option. Thank you! Is this option currently considered stable / safe for general use? It doesn't appear to be listed among Setup's documented command-line arguments: * https://cygwin.com/faq.html#faq.setup.cli At least with the option combinations I've tested, it appears that Setup can be made to avoid writing to the registry. Additionally, the "--root" option seems to work as a means to facilitate Setup handling the changing path of a portable installation. (This also works for keeping Setup outside the installation root.) On the Cygwin usage side of things, registry entries do appear following execution of commands from a DOS prompt such as "bash --login" (like found in Cygwin.bat) and "cygcheck -s". Thank you, Matthew
