The default job limit read /proc/cpuinfo and silently fell back to four anywhere that file is absent, so macOS and the BSDs ran at a fraction of the available parallelism. Falls back to getconf _NPROCESSORS_ONLN before the constant.
Handles attached flag forms such as -j4 and -Dname=value, dispatches the subcommands, and prints one aligned line per completed action with a summary.
milner