Don't fail to check syntax before posting! It doesn't get the idea across at all well.

Don't delete your original content (even when unclearly written as your OP was¹); use <strike> ...content you wish to disavow (and possibly wish you had never written)... </strike> and add fresh content with a Update: .... or Note: ....

Poorly written, non-syntax-checked questions rarely draw as many wise responses as you've received. They're more apt to yield flames (this is not one) and downvotes. IOW, make it easy for us to help you, and you'll be almost certain to get good advice.

Update: As a convenience, the deleted original content¹ follows:

Hi all. Is it possible to use a defined variable in defining another variable? See example below, which is not working.

$ecounter=0;
         my @file_line_contents = split (/\|/,$_); 
         while "$ecounter < 45" {
             $e$ecounter=length($file_line_contents[$ecounter]);
             $ecounter+=1;
         }
[download]

I tried concatenating the variables and that did not work either. Code is probably ugly but should convey basically what I am trying to do.

Thanks in advance