How can I redirect the same message to both stdoud and stderr (without temporary file)

Question

It is easy to redirect stdout or stderr to the same output (file or one of the 2 std output) with a 1>&1,>&2 and/or >file but is there a way to send the same output to both the std output in KSH (like | tee File but with &2 as file) ?

Didn't get your question. What is problem in `command 2>&1`? — anubhava, Nov 10 '14 at 10:36
`2>&1` only redirect stdout to stdout but you loose stdout in this case. I try to have the stream to stdout AND on stderr at the same time (duplicate the output, one on each channel) but without using temporary obejct (variable or file) — NeronLeVelu, Nov 10 '14 at 11:34
@Etan Reisner: it's just the opposite of `&>` where all the stream goes to 1 stream (and it doesn not work on KSH like in BASH) — NeronLeVelu, Nov 10 '14 at 13:08

Walter A · Accepted Answer · 2014-11-28T22:06:28.110

1

#!/bin/ksh

function mytee { 
        while read -r x ; do
                print "${x}"
                print "${x}" >&2
        done
}

echo "TestMyTee
second line
and a * character" | mytee

# Really stdout and stderr?
echo "TestMyTee
second line
and a * character" | mytee 1>mystdout 2>mystderr

Edited: replaced [read] and [echo] by [read -r] and [print]

edited Nov 28 '14 at 22:06

answered Nov 28 '14 at 10:04

Walter A

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ok, quite simple batch, good idea. Just adapt the read to allow `\\` with a -r and maybe use a printf instead of echo to avoid interpretation by shell – NeronLeVelu Nov 28 '14 at 10:29

score 0 · Answer 2 · edited Apr 13 '17 at 12:36

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Post: How can I redirect the same message to both stdoud and stderr (without temporary object)

by Stéphane Chazelas

{ your-code } | perl -pe 'print STDERR'

edited Apr 13 '17 at 12:36

Community

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answered Nov 28 '14 at 10:38

NeronLeVelu

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How can I redirect the same message to both stdoud and stderr (without temporary file)

2 Answers2