The parent I think is getting two things mixed up. [[ $var == "" ]] works as you describe and as expected. What the parent is talking about is when you ha

The parent I think is getting two things mixed up. [[ $var == "" ]] works as you describe and as expected. What the parent is talking about is when you have an invocation like my_program $opt my_program "$opt" Which when empty will evaluate to my_program my_program "" respectively.