bash: bad array subscript
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When iterating over an array, you may encounter the error:
myscript.sh: line N: bad array subscript
Check that you are not trying to access a value in the array using a negative index.
Also check that when trying to print something like ${my_map[$KEY]}, $KEY does evaluate to something valid, that it is not an empty string. ${my_map[]} would produce the error above.