It would be really useful to have /bin/fail, which could just be a symlink to /bin/echo and would cause it to print to stderr instead of stdout, and to exit non-zero. /bin/warn, OTOH, could write to stderr, but not alter the exit code.
It would be really useful to have /bin/fail, which could just be a symlink to /bin/echo and would cause it to print to stderr instead of stdout, and to exit non-zero. /bin/warn, OTOH, could write to stderr, but not alter the exit code.