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www/eps/hpr2719/hpr2719_bash17_ex4.sh

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+#!/bin/bash
+
+#-------------------------------------------------------------------------------
+# Example 4 for Bash Tips show 17: Using "substring expansion" to extract
+# associative array elements
+#-------------------------------------------------------------------------------
+
+#
+# Make two indexed arrays each containing 6 random words. Note: this is not
+# the best way to do this!
+#
+declare -a a1=( $(for word in $(grep -E -v "'s$" /usr/share/dict/words | shuf -n 6); do echo $word; done) )
+declare -a a2=( $(for word in $(grep -E -v "'s$" /usr/share/dict/words | shuf -n 6); do echo $word; done) )
+
+#
+# Build an associative array using one set of words as subscripts and the
+# other as the values
+#
+declare -A hash
+for ((i=0; i<6; i++)); do
+    hash[${a1[$i]}]="${a2[$i]}"
+done
+
+#
+# Display the associative array contents
+#
+echo "Contents of associative array 'hash'"
+for key in "${!hash[@]}"; do
+    printf '%s=%s\n' "hash[$key]" "${hash[$key]}"
+done
+echo
+
+#
+# Walk the associative array printing pairs of values
+#
+echo "Pairs of values from array 'hash'"
+for ((i=1; i<6; i+=2)); do
+    printf '%d: %s\n' "$i" "${hash[*]:$i:2}"
+done