the -S needs to come before the -o and you need to remove the .png from the filename.
altho I don't understand why do you want that option, given that the files will already be numbered.
trying
i=1;for x in `cat add2.txt`; do qrencode -S -o $i $x; ((i++); done
is returning
bash: syntax error near unexpected token `done'
I need the files in order, because the order they are in the txt file is very different then "alphabetical" how it dumps out on my desktop
I tried moving my excel around and it counts differently.
the files are saving as the bitcoin address, and it acting weird with the order
1A...
1Z
11
vr
11
12..
1A
I tried sorting by "time" but that didnt work