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www/eps/hpr2719/hpr2719_bash17_ex1.sh

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