# Exitcode 0 (`` has no exitcode, but assignment has): true; a=``; echo $? false; a=``; echo $? true; a=$(); echo $? false; a=$(); echo $? # Exitcode 2 (`cmd` expansion sets exitcode after assignment set it to 0): true; a=`exit 2`; echo $? false; a=`exit 2`; echo $? true; a=$(exit 2); echo $? false; a=$(exit 2); echo $? # Exitcode 1 (redirect sets exitcode to 1 on error after them): true; a=`` >/does/not/exist; echo $? false; a=`` >/does/not/exist; echo $? true; a=$() >/does/not/exist; echo $? false; a=$() >/does/not/exist; echo $? true; a=`exit 2` >/does/not/exist; echo $? false; a=`exit 2` >/does/not/exist; echo $? true; a=$(exit 2) >/does/not/exist; echo $? false; a=$(exit 2) >/does/not/exist; echo $?