tests/arith2.sub

   1 echo $(( --7 ))
   2 echo $(( ++7 ))
   3 echo $(( -- 7 ))
   4 echo $(( ++ 7 ))
   5
   6 ((++array[0] ))
   7 echo $array
   8 (( ++ array[0] ))
   9 echo $array
  10
  11 (( ++a ))
  12 echo $a
  13 (( ++ a ))
  14 echo $a
  15
  16 (( --a ))
  17 echo $a
  18 (( -- a ))
  19 echo $a
  20
  21 echo $(( 4 + ++a ))
  22 echo $a
  23
  24 echo $(( 4+++a ))
  25 echo $a
  26
  27 echo $(( 4---a ))
  28 echo $a
  29
  30 echo $(( 4 - -- a ))
  31 echo $a
  32
  33 (( -- ))
  34 echo $(( ---7 ))
  35 echo $(( -- - 7 ))
  36
  37 (( ++ ))
  38 echo $(( ++7 ))
  39 echo $(( ++ + 7 ))
  40
  41 echo $(( ++-7 ))
  42 echo $(( ++ - 7 ))
  43
  44 echo $(( +--7 ))
  45 echo $(( -- + 7 ))