dos命令、批处理学习最困难的就是FOR命令的使用。该书非常详尽的介绍了FOR命令在批处理中的用法。面面俱到，简洁生动。-dos commands, batch learning the most difficult thing is the use of the FOR command. The book is very detailed introduction to the use of the FOR command in a batch. Comprehensive, concise and vivid.