但是,从cpanm 1.1.2开始,它会自动清理超过7天的工作目录.您可以使用–auto-cleanup选项更改此数字：

--auto-cleanup
  Specifies the number of days in which cpanm's work directories expire. 
  Defaults to 7,which means old work directories will be cleaned up in one week.

  You can set the value to 0 to make cpan never cleanup those directories.