35 lines
629 B
Bash
35 lines
629 B
Bash
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#!/bin/bash
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#-------------------------------------------------------------------------------
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# Example 1 for Bash Tips show 17: Negative indices
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#-------------------------------------------------------------------------------
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#
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# Seed the Fibonacci sequence in an indexed array
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#
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declare -a fib=(0 1 1)
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#
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# Populate the rest up to (and including) the 20th element
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#
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for ((i = 3; i <= 20; i++)); do
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fib[$i]=$((fib[i-2]+fib[i-1]))
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done
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#
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# Show the whole array
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#
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echo "Fibonacci sequence"
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echo "${fib[*]}"
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echo
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#
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# Print a few elements working backwards
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#
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for i in {-1..-4}; do
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echo "fib[$i] = ${fib[$i]}"
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done
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exit
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