Testing a command's stored exit status with var=$?; [[ $var ]] is always true, whether 0 or 1

Question

Consider:

true; run_backup=$?
if [[ $run_backup ]]; then
  echo \"The user wants to run the backup\"
fi

...and...

false; ru         


        

Answer 1

The answer is yes, because neither 0 nor 1 is NULL.