Yes, general idea is still very important and useful, but this is post about specific command called "APPEND" in MS-DOS environment. Also, it's not an equivalen

Yes, general idea is still very important and useful, but this is post about specific command called "APPEND" in MS-DOS environment. Also, it's not an equivalent of "ln -sr" as "ln" replaces targets and not stacks them. The proper modern equivalents are environment variables like LD_LIBRARY_PATH, PYTHONPATH, PKG_CONFIG_PATH, etc... and overlayfs mounts for a generic case. But back to the APPEND: in all my time working with MS-DOS, I don't remember ever needing that, so it was 100% irrelevant to me. But this could be because I've worked with more "modern" programs (like Turb Pascal 5) which had good support for directories.