The "if !" syntax isn't available on old enough shells. Probably not an issue for most people in 2026 -- you have to back pretty far for it to be missing. Tec

The "if !" syntax isn't available on old enough shells. Probably not an issue for most people in 2026 -- you have to back pretty far for it to be missing. Technically, though, "if x; then :; else" is more portable.