AFAIK /bin/sh is standard; if you cannot trust that /bin/sh is a Bourne-like sh, you might as well have to assume /usr/bin/env can not be what it was meant to b

AFAIK /bin/sh is standard; if you cannot trust that /bin/sh is a Bourne-like sh, you might as well have to assume /usr/bin/env can not be what it was meant to be too.