目录一、目录与文件查看：探索文件系统1. ls命令：查看文件列表（重要）2. pwd：显示当前所在位置3. cd：进入指定路径二、文件与目录操作：创建、修改与删除的基本技能1. touch：创建空文件与更新时间戳2. mkdir：目
I have a NSMutableArray I get by loading a plist into it. The date field comes in as a string and i want to change it into a nsdate. I can change an nsstring into an nsdate.
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