How to get value of variable nested in same config file in unix shell

Question

I have config file where variables are defined

A=b c d
b=BALL
c=CAT
d=DOG

This is my script:

for word in $A
do
    for config in $word
    do
        echo $config
    done
    echo "End of nested for loop"
done

Above prints

b
c
d

I need values of b c and d

Ball
CAT 
DOG

Answer 1

You have to access the variable that is pointed by your variable, not your variable itself:

for word in $A
do
    for config in ${!word}
    do
        echo $config
    done
    echo "End of nested for loop"
done

Here you can find more information

Answer 2

You can use the following :

#!/bin/bash

A="b c d"
b=BALL
c=CAT
d=DOG


for word in $A
do
    for config in $word
    do
        echo ${!config}
    done
    echo "End of nested for loop"
done

Answer 3

You logically only have a single loop, not a nested one, so you also should implement only a single loop:

for variable in $A
do
  echo "${!variable}"
done

Btw, you will need to have quotes around the assignment with spaces if you simply execute it in the bash:

A='a b c'