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In [..](..), use || instead of -o.

Problematic code:

[[ "$1" = "-v" -o "$1" = "-help" ]]

Correct code:

[[ "$1" = "-v" || "$1" = "-help" ]]

Rationale:

-o for logical OR is not supported in a [[ .. ]] expression. Use || instead.

Exceptions:

None.

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