Test Script 70: BASH pseudo-multidimensional array iteration over any dimension

script70.sh

#!/usr/bin/env bash

var1=([0]="first" [1]="second" [2]="third" [5]="sixth" [10]="eleventh");
n=([0]="0" [1]="1" [2]="2" [5]="5" [10]="10");
var2=([0]="zero" [1]="one" [2]="two" [5]="five" [10]="ten");

printf '\n`echo \"${var1[@]}\"` s output:\t'; echo "${var1[@]}";
printf '`echo \"${!var1[@]}\"` s output:\t'; echo "${!var1[@]}";

printf '\nWith `${var1[@]}`:\n';
for i in "${var1[@]}";
do
	echo "${var1[i]}""   "$'\t'"${n[i]}"$'\t'"${var2[i]}";
done;
printf '... BASH gets the wrong value, ${var1\e[9m[i]\e[29m}, thus it shits in the glue.\n';

printf '\nWith `${!var1[@]}`:\n';
for i in "${!var1[@]}";
do
	echo "${var1[i]}""   "$'\t'"${n[i]}"$'\t'"${var2[i]}";
done;
printf '... BASH gets the right value, ${\e[8m!\e[28m\e[9mvar1[\e[29mi\e[9m]\e[29m}, thus it does well.\n';

printf '\n';

# script70.sh
# Test Script 70: BASH pseudo-multidimensional array iteration over any dimension
#
# Author: Karl V. P. Bertin `kvpb`
# Phone number: +33 A BB BB BB BB
# Email: local-part@domain
# LinkedIn: https://www.linkedin.com/in/karlbertin
# Facebook: https://www.facebook.com/profile.php?id=
# Instagram: https://www.instagram.com/karlbertin/
# Snapchat: https://www.snapchat.com/add/karlbertin

zz.bash_history

var=([0]="value 1" [2]="value 2" [10]="value 3" [11]="value 4"); x=([0]="1" [1]="jeej" [2]="le,kk" [10]="pet de vache"); for i in ${var[@]}; do echo "${var[i]}"$'\t'$'\t'"${x[i]}"; done
var1=([0]="0" [1]="1" [2]="2" [5]="5" [10]="10"); var2=([0]="zero" [1]="one" [2]="two" [5]="five" [10]="ten"); for i in ${var1[@]}; do echo "${var1[i]}""  "$'\t'"${var2[i]}"; done # fucky: var1=([0]="a" [1]="b" [2]="c" [5]="f" [10]="j"); var2=([0]="zero" [1]="one" [2]="two" [5]="five" [10]="ten"); for i in ${var1[@]}; do echo "${var1[i]}""  "$'\t'"${var2[i]}"; done
var1=([0]="0" [1]="1" [2]="2" [5]="5" [10]="10"); var2=([0]="zero" [1]="one" [2]="two" [5]="five" [10]="ten"); for i in ${var1[@]}; do echo "${var1[i]}""  "$'\t'"${var2[i]}"; done
var1=([0]="a" [1]="b" [2]="c" [5]="f" [10]="j"); var2=([0]="zero" [1]="one" [2]="two" [5]="five" [10]="ten"); for i in ${var1[@]}; do echo "${var1[i]}""  "$'\t'"${var2[i]}"; done
var1=([0]="a" [1]="b" [2]="c" [5]="f" [10]="j"); var2=([0]="zero" [1]="one" [2]="two" [5]="five" [10]="ten"); for ((i=0; i<${#var1[@]}; i++)); do echo "${var1[i]}""  "$'\t'"${var2[i]}"; done
echo ${var1[*]}; echo ${var1[@]}; echo "${var1[@]}"; echo "${!var1[@]}"
var1=([0]="a" [1]="b" [2]="c" [5]="f" [10]="j"); var2=([0]="zero" [1]="one" [2]="two" [5]="five" [10]="ten"); for i in "${!var1[@]}"; do echo "${var1[i]}""  "$'\t'"${var2[i]}"; done

zzsources.md

References

Array Basics In Shell Scripting: Set 1

Jordan jordanm Metzmeier's answer