BASH shell scriptでの二次元配列(風)

うまい参考がなかったので、下記にメモ。二次元配列風 bash。下記をファイル名fileとして保存

#!/bin/bash

ARRAYS=("a 1" "b 2 3" "ccc 4 5 6")

for ARRAY in "${ARRAYS[@]}"
do
  #echo ARRAY is \" "${ARRAY}" \"
  ARRAY=(`echo ${ARRAY}`)
  for ELEM in "${ARRAY[@]}"
    do
      echo "${ELEM}"
    done
done

結果

~$ bash file
a
1
b
2
3
ccc
4
5
6

~$bash -x file

ARRAYS=("a 1" "b 2 3" "ccc 4 5 6")
for ARRAY in "${ARRAYS[@]}"
ARRAY=(`echo ${ARRAY}`)

echo a 1

for ELEM in "${ARRAY[@]}"
echo a
a

for ELEM in "${ARRAY[@]}"
echo 1
1

for ARRAY in "${ARRAYS[@]}"
ARRAY=(`echo ${ARRAY}`)

echo b 2 3

for ELEM in "${ARRAY[@]}"
echo b
b

for ELEM in "${ARRAY[@]}"
echo 2
2

for ELEM in "${ARRAY[@]}"
echo 3
3

for ARRAY in "${ARRAYS[@]}"
ARRAY=(`echo ${ARRAY}`)

echo ccc 4 5 6

for ELEM in "${ARRAY[@]}"
echo ccc
ccc

for ELEM in "${ARRAY[@]}"
echo 4
4

for ELEM in "${ARRAY[@]}"
echo 5
5

for ELEM in "${ARRAY[@]}"
echo 6
6