Because your last pipe will pipe BOTH output of `echo` AND `head` with delay due to fork, head output will comme after. try this:
echo -e '9\n4\n3\n2\n8\n7\n3\n1' |tee >(head -1 >&2) |tail -1 or echo -e '9\n4\n3\n2\n8\n7\n3\n1' |tee >(head -1 >&2) >(tail -1 >&2) >/dev/null ... On Mon, Sep 06, 2021 at 07:38:03AM +0000, Budi wrote: > How come tail coreutil cannot work as its input is from tee > > $ echo -e '9\n4\n3\n2\n8\n7\n3\n1' |tail -1 > 1 > > But : > > $ echo -e '9\n4\n3\n2\n8\n7\n3\n1' |tee >(head -1) |tail -1 > 9 > > Please help explain > -- Félix Hauri - <fe...@f-hauri.ch> - http://www.f-hauri.ch
