Basic algorithm programming for shell scripts

First question: Recursion and non-recursion of Fibonacci sequences

Non-recursive:

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Recursion:

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Note that the range of return under the shell is 0-255, which cannot be used RETURN1

Second question: string intercept cut

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Question three: Ask for 100 numbers

The first type of non-recursive:

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The second kind of recursion

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The Third kind of tool

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Fourth: The maximum value of three numbers, the minimum value, the average

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Basic algorithm programming for shell scripts