Re: How to pipe just stderr to stdin in a pipeline?

[Peng Yu]

I did. Pipeline was mentioned in the subject.

On Sun, May 10, 2020 at 2:43 PM Andreas Kusalananda Kähäri <
address@hidden> wrote:

> On Sun, May 10, 2020 at 01:58:16PM -0500, Peng Yu wrote:
> > That is not a pipeline. And, different from a pipeline, the status in
> > >(cmd) can not be gotten easily.
>
> Maybe you should have stated you requirements from the start?
>
>
> >
> > On Sun, May 10, 2020 at 8:27 AM Pierre Gaston <address@hidden>
> wrote:
> > >
> > > you could do : somecommand 2> >(othercommand)
> > >
> > > On Sun, May 10, 2020 at 6:14 AM Peng Yu <address@hidden> wrote:
> > >>
> > >> But this an external command which can not run bash functions by
> > >> definition. I need something native to bash.
> > >>
> > >> On 5/9/20, Pier Paolo Grassi <address@hidden> wrote:
> > >> > take also a look at pipexec:
> > >> >
> > >> > https://github.com/flonatel/pipexec
> > >> >
> > >> >
> > >> > Il giorno dom 10 mag 2020 alle 05:24 Peng Yu <address@hidden>
> ha
> > >> > scritto:
> > >> >
> > >> >> Thanks. The original stdout must be redirected back to stdout (see
> > >> >> "2>&1"). I have to use something like this to do it. This looks
> quite
> > >> >> cumbersome.
> > >> >>
> > >> >> $ { { echo error 1>&2; echo out; } 3>&1 1>&2 2>&3 | awk -e '{ print
> > >> >> "awk:", $0 }'; } 2>&1 | awk -e '{ print "awk2: " $0 }'
> > >> >> awk2: out
> > >> >> awk2: awk: error
> > >> >>
> > >> >> Is it better to add an operator similar to | and |& so that only
> > >> >> stderr is piped to stdin of the next command in the pipeline?
> > >> >>
> > >> >> On Sat, May 9, 2020 at 10:11 PM Pier Paolo Grassi
> > >> >> <address@hidden> wrote:
> > >> >> >
> > >> >> > I would use:
> > >> >> >
> > >> >> > {cmd1 3>&2 2>&1 1>&3 } | cmd2
> > >> >> >
> > >> >> > Il giorno dom 10 mag 2020 alle ore 05:04 Peng Yu <
> address@hidden>
> > >> >> ha scritto:
> > >> >> >>
> > >> >> >> | pipes stdout to stdin in a pipeline
> > >> >> >> |& pipes both stdout and stderr to stdin in a pipeline
> > >> >> >>
> > >> >> >> What is the best way to just pipe stderr (but not stdout) to
> stdin in
> > >> >> >> a pipeline? Thanks.
> > >> >> >>
> > >> >> >> --
> > >> >> >> Regards,
> > >> >> >> Peng
> > >> >> >>
> > >> >>
> > >> >>
> > >> >> --
> > >> >> Regards,
> > >> >> Peng
> > >> >>
> > >> > --
> > >> > Pier Paolo Grassi
> > >> >
> > >>
> > >>
> > >> --
> > >> Regards,
> > >> Peng
> > >>
> >
> >
> > --
> > Regards,
> > Peng
>
> --
> Andreas (Kusalananda) Kähäri
> SciLifeLab, NBIS, ICM
> Uppsala University, Sweden
>
> .
>
-- 
Regards,
Peng