Bash Passing an indirect reference to a function

#!/bin/bash
# ind-func.sh: Passing an indirect reference to a function.

echo_var ()
{
echo "$1"
}

message=Hello
Hello=Goodbye

echo_var "$message"        # Hello
# Now, let's pass an indirect reference to the function.
echo_var "${!message}"     # Goodbye

echo "-------------"

# What happens if we change the contents of "hello" variable?
Hello="Hello, again!"
echo_var "$message"        # Hello
echo_var "${!message}"     # Hello, again!

exit 0

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Bash Passing an indirect reference to a function