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

[Peng Yu]

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