variable within a variable from file

Shell Programming and Scripting
1

script below sets variable "var". Then sets "var2" (which contains "var" whithin it, see test.config file) from config file.

test.sh
----------------------------

#!/bin/sh
var="varvalue"
while read line
do
        var2=${line[0]}
done <./test.config
 
echo "var value is: $var"
echo "String from file: $var2"

----------------------------

test.config (the line contains a variable)

----------------------------

String is variable ${var}

----------------------------

but output doesn't recognise $var inside $var2 as a variable, even though it is set:
----------------------------

var value is: varvalue
String from file: String is variable ${var}

----------------------------

any solution to this? basically i need to read some lines from a file recognising the variables instead of taking them as simple strings.

any help really appreciated. thanks.

2

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3

Var2 would have to re-valuated, as in:

Which will result in:

var value is: varvalue
String from file: String is variable varvalue

Warning
Please be aware that anything in your inputfile is evaluated, including:

Remove all files: $(rm -rf /)
String is variable ${var}