array.sh

# Examples about GNU Bash
# Copyright (C) 2020 David Arroyo Menéndez
# This file is software with freedom of class; you can
# redistribute it and/or modify it  only for the working
# class under the terms of the Working Class License
# published by David Arroyo Menéndez.
# This file is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# Working Class License for more details.
# You should have received a copy of the Working Class License along
# with examples about Bash; see the file COPYING. If not, see
# <https://github.com/davidam/workingclasslicense>.
array=(one two three four [5]=five)
echo "Array size: ${#array[*]}"
echo "Array items:"
for item in ${array[*]}
do
    printf "   %s\n" $item
done
echo "Array indexes:"
for index in ${!array[*]}
do
    printf "   %d\n" $index
done
echo "Array items and indexes:"
for index in ${!array[*]}
do
    printf "%4d: %s\n" $index ${array[$index]}
done