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true; a=1; echo Zero1:$?
false; a=1; echo Zero2:$?
false || a=1; echo Zero3:$?
false || x=$? y=`echo $?`; echo Zero4:$? x:$x y:$y
false || x=$? y=`echo $?; exit 3`; echo Three:$? x:$x y:$y
#ash sets z=1 instead of z=3. disabled for now
#false || x=$? y=`echo $?; exit 3` z=`echo $?`; echo x:$x y:$y z:$z
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