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+ GETBIT _key_ _offset_ (Redis >
2.1.8) = +Time complexity: O(1)Returns the bit value at offset in the string value stored at key.+When offset is beyond the string length, the string is assumed to be a contiguous space with 0 bits. When key does not exist it is assumed to be an empty string, so offset is always out of range and the value is also assumed to be a contiguous space with 0 bits.