just fyi, `shift` doesn't affect $0, it slides the window of $1..$N back, so you don't want to shift after grabbing $0 and you don't want to change the option l

just fyi, `shift` doesn't affect $0, it slides the window of $1..$N back, so you don't want to shift after grabbing $0 and you don't want to change the option loop if you do this. And you can just use $0 everywhere so there's technically no reason to pull it out into a $executable variable, but tbh that gets a bit confusing in functions.