#!/bin/bash
echo '##### test of array #####'
echo 'ARRAY=(one two)'
ARRAY=(one two)
echo '  ${#ARRAY[@]} is: '${#ARRAY[@]}
echo '  ${!ARRAY[@]} is: '${!ARRAY[@]}
echo
echo ' # Let us push one element at the end'
echo ' ELEMENTS=${#ARRAY[@]}'
       ELEMENTS=${#ARRAY[@]}
echo ' ARRAY[$ELEMENTS]=three'
       ARRAY[$ELEMENTS]=three
echo '  ${#ARRAY[@]} is: '${#ARRAY[@]}
echo
echo '  $ARRAY is: '$ARRAY
echo
echo '  ${ARRAY[@]}' is: ${ARRAY[@]}
echo '  echo ${ARRAY[@]} by "for" loop:'
for i in ${ARRAY[@]}; do
  echo '    '$i
done
echo
echo '  ${ARRAY[*]}' is: ${ARRAY[*]}
echo '  echo ${ARRAY[*]} by "for" loop:'
for i in ${ARRAY[*]}; do
  echo '    '$i
done
echo
echo '  "${ARRAY[@]}"' is: "${ARRAY[@]}"
echo '  echo "${ARRAY[@]}" by "for" loop:'
for i in "${ARRAY[@]}"; do
  echo '    '$i
done
echo
echo '  "${ARRAY[*]}"' is: "${ARRAY[*]}"
echo '  echo "${ARRAY[*]}" by "for" loop:'
for i in "${ARRAY[*]}"; do
  echo '    '$i
done
echo

echo '  ## slice of array ##'
echo '  ARRAY=(one two three four five six)'
        ARRAY=(one two three four five six)
echo '    ${ARRAY[@]: 0: 1} is:' ${ARRAY[@]: 0: 1}
echo '    ${ARRAY[@]: 2: 3} is:' ${ARRAY[@]: 2: 3}
echo '    ${ARRAY[@]: 2}    is:' ${ARRAY[@]: 2}
echo '    ${ARRAY[@]: -4: 3} is:' ${ARRAY[@]: -4: 3}
echo '    ${ARRAY[@]: -4}   is:' ${ARRAY[@]: -4}
echo '    ${ARRAY[@]: -1}   is:' ${ARRAY[@]: -1}
echo '    ${ARRAY[((${#ARRAY[@]}-1))]} is:' ${ARRAY[((${#ARRAY[@]}-1))]}

echo
echo '  ## how to copy an array ##'
echo '  ARRAY=(one two three four five six)'
echo '  ACOPY=(${ARRAY[@]})'
        ACOPY=(${ARRAY[@]})
echo '  echo "${ACOPY[@]}" by "for" loop:'
for i in "${ACOPY[@]}"; do
  echo '    '$i
done
echo
echo '  unset ACOPY'
        unset ACOPY
echo "  # without re-specifying parentheses it fails even if you use 'declare' builtin"
echo '  declare -a ACOPY=${ARRAY[@]}'
        declare -a ACOPY=${ARRAY[@]}
for i in "${ACOPY[@]}"; do
  echo '    '$i
done
echo '  echo ${ACOPY[0]}'
echo '    '${ACOPY[0]}
echo
echo '  unset ACOPY'
        unset ACOPY
echo '  # another successfull way to copy an array'
echo '  unset ARRAY[3]'
unset ARRAY[3]
cat <<'EOM'
  for i in "${!ARRAY[@]}"; do
    ACOPY[$i]=${ARRAY[$i]}
  done
EOM
for i in "${!ARRAY[@]}"; do
  ACOPY[$i]=${ARRAY[$i]}
done
echo '  # print values with indices'
for i in "${!ACOPY[@]}"; do
  echo '    '$i'    '${ACOPY[$i]}
done
echo

echo '  ## replace functions for array ##'
echo '  ARRAY=(one.bin.back two.bin.back three.bin.back)'
        ARRAY=(one.bin.back two.bin.back three.bin.back)
echo '    ${ARRAY[@]/bin/exe} is:' ${ARRAY[@]/bin/exe}
echo '    ${ARRAY[@]} is: ' ${ARRAY[@]}
echo
echo '    ${ARRAY[@]#o*.} is:' ${ARRAY[@]#o*.}
echo '    ${ARRAY[@]##o*.} is:' ${ARRAY[@]##o*.}
echo '    ${ARRAY[@]%.b*k} is:' ${ARRAY[@]%.b*k}
echo '    ${ARRAY[@]%%.b*k} is:' ${ARRAY[@]%%.b*k}
echo
exit