Forums Scripts & Popups Help with script (if elseif and variables)

doh yes now i understand and it should work, but it doesnt just nothing happens. and how does variable "a" gets its value?

EDIT: got it to work but it still doesnt show values like "-s" in the infoline . its says -S Unknown command and i cant understand what purpose variable "a" has in there. it should display the -r and value in the infoline, but why theres 2 of them like in here:
if ($did(6, seltext) isalnum) { %a %a -g $v1 }