while (<DATA>)
  {
    print "$2\t=>$1\n" if /^(.*?)\s+(.*?)$/;
  }

  __DATA__
  0       5713813
  276k    CVS_RES
  264k    Desktop
  17k     Documes
  33k     SEARCH

##</code><code>##

  map {print "$2\t=>$1\n" if /^(.*?)\s+(.*?)$/} <DATA>;

  __DATA__
  0       5713813
  276k    CVS_RES
  264k    Desktop
  17k     Documes
  33k     SEARCH