ksh - Why is this pipeline behave differently in ksh93 compared to bash? -


i had issue ksh93 code. complex started reducing example code reproduce same issue. ended this:

set -o pipefail;  {         echo "progress" 1>&3 | false } 3>&1 | cat | \         while read pv_output;                 echo "meanwhile ... got "                 echo $pv_output | cat         done  echo $?

when run code ksh93 outputs "0", when run bash outputs "1".

# echo "ksh93";ksh93 ./x1.sh ;echo "bash"; bash ./x1.sh ksh93 meanwhile ... got progress 0 bash meanwhile ... got progress 1

however if start fiddling code, , remove first cat, both shells return "1"

set -o pipefail;  {         echo "progress" 1>&3 | false } 3>&1 | \         while read pv_output;                 echo "meanwhile ... got "                 echo $pv_output | cat         done  echo $?

or... if leave in first cat, remove second 1 inside while, work same way again.

set -o pipefail;  {         echo "progress" 1>&3 | false } 3>&1 | cat | \         while read pv_output;                 echo "meanwhile ... got "                 echo $pv_output         done  echo $?

now, example used cat simplicity's sake. in real life first cat awk processing output of complicated command. second cat sed. mention these, clear cat command in not culprit.


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