[新手入门]
查找文件大小大于2m的文件
-size n
Evaluates to the value True if the file is the specified n of blocks long (512 bytes per block). The file size is
rounded up to the nearest block for comparison.
-size nc
Evaluates to the value True if the file is exactly the specified n of bytes long. Adding c to the end of the n
variable indicates that the size of the file is measured in individual bytes not blocks.