>>>Loading..........

gawk '
  {
    cmd="md5sum " q FILENAME q
    cmd | getline cksm
    close(cmd)
    sub(/ .*$/,"",cksm)
    if(a[cksm]++){
      cmd="echo rm " q FILENAME q
      system(cmd)
      close(cmd)
    }
    nextfile
  }' q='"' *