Exporting variable with a specific log

Question

Problematic

Exporting a variable can be done in KSH via the command:

export EXAMPLE1="A"
export EXAMPLE2="B"
export EXAMPLE3="C"

However I want to echo the user that the variable has been redefined:

echo ${!EXAMPLE1@}" -> "$EXAMPLE1
echo ${!EXAMPLE2@}" -> "$EXAMPLE2
echo ${!EXAMPLE3@}" -> "$EXAMPLE3

The aim is to do both actions in a single line of code because I have several environment variables to assign.

What I've done

To answer the problem, I have made a define function that combines both commands:

define() {
    var=$1
    val=$2

    export var=$val
    echo ${!var@}" -> "$var
}

EXAMPLE1="A"
EXAMPLE2="B"
EXAMPLE3="C"

define $EXAMPLE1 "X"
define $EXAMPLE2 "Y"
define $EXAMPLE3 "Z"

But it doesn't give the expected result. Instead of receiving:

EXAMPLE1 -> X
EXAMPLE2 -> Y
EXAMPLE3 -> Z

, I receive the following output:

var -> X
var -> Y
var -> Z

, and the environment variables are still set to A, B and C. It seems that my method assigns the local variable var instead of my environment variable.

What could be a solution to my problem?

Answer 1

Don't call your function with $EXAMPLE1 but with EXAMPLE1.
I made more modifications:

define() {
    var=$1
    val=$2
    export $var=$val
    echo "${var} -> ${val}"
}

EXAMPLE1="A"
EXAMPLE2="B"
EXAMPLE3="C"

define EXAMPLE1 "X"
define EXAMPLE2 "Y"
define EXAMPLE3 "Z"