Paul Eggert <[email protected]> writes: > On 2025-11-02 01:24, Bruno Haible via GNU coreutils Bug Reports wrote: >> We could document that users should not use environment variables >> that start with "__" > > In addition to Pádraig's qualms, POSIX says[1] that if an environment > variable's name consists solely of uppercase ASCII letters, '_', and > non-initial digits, the variable might affect the behavior of standard > utilities like 'cat'. So if we document environment variable gotchas, > we should document that one too.
That sounds like a good idea, but I am not too sure where it would be placed since it applies to all programs. Perhaps the Coreutils FAQ should be revived [1]? Collin [1] https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#uname-is-system-specific
