一个命令行下的MD5校验工具 ，用法：MD5AV [-c] [-f<FolderName>] [-h] [-n<FileName>] [-o<OutputFolder>] [-r] [-v] [-x<FolderName]-MD5ArchiveValidator (MD5AV) is a utility to confirm the accurate storage of files through MD5 Checksums. For each file in question, MD5AV computes the MD5 Checksum of the contents and stores the result in a summary file. MD5AV can then use the summary information to verify the content of each file hasn’t changed. Please note: as of this time, MD5AV will only check the first 4 GB of each file