Creating a string variable name from the value of another string

Question

In my bash script I have two variables CONFIG_OPTION and CONFIG_VALUE which contain string VENDOR_NAME and Default_Vendor

Answer 1

For pure shell, possibly try:

#!/usr/bin/env sh

option=vendor_name
value="my vendor"

eval $option="'$value'" # be careful with ', \n, and \ in value
eval echo "\$$option" # my vendor
echo "$vendor_name" # my vendor

Why?

#!/usr/bin/env sh
printf -v "var" "val" # prints the flag, var not set
declare var=val # sh: declare: not found
echo ${!var} # sh: syntax error: bad substitution

I don't like eval, but are there any POSIX options?