in Bash Script, how to read a file and split all lines into a two-dimensional array

Content of the file:

Class_one 23
Class_two 17
Class-three 22
..

How to read the file and split all lines into a two-dimensional array? like java. Like:

arr[0][0] = Class_one    arr[0][1] = 23
arr[1][0] = Class_two    arr[1][1] = 17

thanks.

Answer

GNU bash has no two-dimensional array. A workaround is an associative array.

#!/bin/bash

declare -A arr  # declare an associative array
declare -i c=0

# read from stdin (from file)
while read -r label number; do
  arr[$c,0]="$label"; arr[$c,1]="$number"
  c=c+1
done < file

# print array arr
for ((i=0;i<${#arr[@]}/2;i++)); do
  echo "${arr[$i,0]} ${arr[$i,1]}"
done

---

See: help declare and man bash