Hmm, really. You wouldn't pull my leg, would you? You really think that was a serious answer, or just a zinger from a self-impressed phony without a name attempting to put me down? Or are you just blowing smoke? In debian: Linux Debian 4.9.0-4 amd 64, GNU bash v4.4. In macOS: Darwin Kernel Version 17.4.0, GNU bash 3.2. I guess when they implemented v4.4 they took stuff out?