lost some of the photos I took in vrchat tonight due to a foolish programming error on my part :(
convert path/*.png && rm path/*.png
can call those two programs with two different sets of arguments if you run this while still copying files over, deleting all the files that didn't get converted;
convert is called with the list of matching files as they stand immediately, then rm is called with the list of matching files after convert has finished
don't be like me