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Comment on the previous solution: it allows echo ${array[-i]} because the =( ) splits on IFS i.e. space and newline.

If there is a cyclic shift, the % operator (modulo) is nice!
The following...

You seem to have some logical errors in your script:
- mixing up array indices with array values (tmp being assigned a value but then used for an index).

- using a constant (2) when the shift...