- rename "$fn.oooo", "$fn.ooooo" if -e "$fn.oooo";
- rename "$fn.ooo", "$fn.oooo" if -e "$fn.ooo";
- rename "$fn.oo", "$fn.ooo" if -e "$fn.oo";
- rename "$fn.o", "$fn.oo" if -e "$fn.o";
- rename "$fn", "$fn.o" if -e "$fn";
+ rename "$fn.oooo", "$fn.ooooo" if -e "$fn.oooo";
+ rename "$fn.ooo", "$fn.oooo" if -e "$fn.ooo";
+ rename "$fn.oo", "$fn.ooo" if -e "$fn.oo";
+ rename "$fn.o", "$fn.oo" if -e "$fn.o";
+ rename "$fn", "$fn.o" if -e "$fn";