# bash 3.2 apparently thinks that ++7 is 7 etc(  echo $(( --7 ))   )(  echo $(( ++7 ))   )(  echo $(( -- 7 ))  )(  echo $(( ++ 7 ))  )#ash# ((++array[0] ))#ash# echo 1 $array#ash# (( ++ array[0] ))#ash# echo 2 $array#ash# (( ++a ))#ash# echo 1 $a#ash# (( ++ a ))#ash# echo 2 $a#ash# (( --a ))#ash# echo 1 $a#ash# (( -- a ))#ash# echo 0 $a      a=0echo 5 $(( 4 + ++a ))echo 1 $a# ash doesn't handle it right...#ash# echo 6 $(( 4+++a ))#ash# echo 2 $a      a=2# ash doesn't handle it right...#ash# echo 3 $(( 4---a ))#ash# echo 1 $a      a=1echo 4 $(( 4 - -- a ))echo 0 $a#ash# (( -- ))# bash 3.2 apparently thinks that ---7 is -7#ash# echo $(( ---7 ))(  echo $(( -- - 7 ))  )#ash# (( ++ ))# bash 3.2: 7#ash# echo 7 $(( ++7 ))(  echo $(( ++ + 7 ))  )# bash 3.2: -7#ash# echo -7 $(( ++-7 ))# bash 3.2: -7#ash# echo -7 $(( ++ - 7 ))# bash 3.2: 7#ash# echo 7 $(( +--7 ))# bash 3.2: 7#ash# echo 7 $(( -- + 7 ))