anchor.diff:  
   end function ff2str
   ! ...
  -! =====================================================================
  +! =============================================================================
   ! ...
   function rndname(iseed) result(name)
   
  
positive.code: return
  end function rndname
  ! ...
  ! =====================================================================
  ! ...
  end module utils
  
negative.code: ! ... Random filename for temporal storage
  ! ... Send the contents of the selected folder to thar filename
  tmpname = '/tmp/'//rndname()
  call system('echo ls '//compress(dirname)//' -1 > '//tmpname)
  call system('ls '//compress(dirname)//' -1 > '//tmpname)
  
  iu = unitfree()
  