Directory Usage script made pure with Unix functions

ds

#!/bin/sh
find ${1:-.} -type f -exec ls -lnq {} \+ | awk '
function pp() {
  u="+Ki+Mi+Gi+Ti";
  split(u,unit,"+");
  v=sum;
  r=0;
  for(i=1;i<5;i++) {
    if(v<1024) break;
    r=v%1024;
    v/=1024;
  }
  printf("%.3f %sB\n",v+r/1024.,unit[i]);
}
{sum+=$5}
END{pp()}'

# captured from http://superuser.com/questions/602818/how-to-get-the-actual-directory-size-out-of-du