2019-12-05 19:13:03 -0000, Sam Kendall: > -nt and -ot are Korn extensions, so there's no POSIX standard behavior > to conform to.
It's widely supported though and may be added to the next version of the POSIX standard. See http://austingroupbugs.net/view.php?id=375 There's hardly any shell/test implementation left that don't support it these days, though as you found out not all of them have been updated to support file systems with subsecond precision timestamps. In any case, I agree it's a bug on systems that support subsecond precision timestamps. find -newer is POSIX, but you'll find some implementations that don't support subsecond timestamps either. $ touch a; touch b $ find b -newer a # GNU's b $ sfind b -newer a # from schily-tools b $ busybox find b -newer a $ -- Stephane
