unix - saving stdout, stderr and both into 3 separate files -

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i using ksh. on link http://www.shelldorado.com/shelltips/advanced.html#redir , there example saving stdout, stderr , both 3 separate files.

((./program 2>&1 1>&3 | tee ~/err.txt) 3>&1 1>&2 | tee ~/out.txt) > ~/mix.txt 2>&1

i tried getting below error:

ksh: syntax error: `(' unexpected

please advice.

pretty works me:

$ ksh $ ps | grep "$$"  6987 pts/6    00:00:00 ksh $ cat program.sh #!/bin/sh  echo "err" 1>&2 echo "out" $ ((./program.sh 2>&1 1>&3 | tee err.txt) 3>&1 1>&2 | tee out.txt) > mix.txt 2>&1 $ cat out.txt out $ cat err.txt err $ cat mix.txt err out

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