zh:zh|md5sum md5sum是一种计算机进程，用于计算与校验RFC 1321所描述的128位MD5哈希值，此处MD5散列值（或校验和）作一个文档的数字指纹使用。

理论上看，正如其他散列算法一样，一个MD5哈希值可对应无限个文档，但从现实的角度看，两个不同的文档几乎不可能有相同的MD5哈希值，除非其创建便是刻意为之。一般来说，任何对一个文档的非恶意变更都会导致其MD5哈希值改变，因此md5sum一般用于检查文档完整性，尤其常用于检测在文档传输、磁盘错误或其他无恶意涉入的情况下文档的正确性。

md5sum is a computer program that calculates and verifies 128-bit MD5 hashes, as described in RFC 1321. The MD5 hash (or checksum) functions as a compact digital fingerprint of a file. As with all such hashing algorithms, there is theoretically an unlimited number of files that will have any given MD5 hash. However, it is very unlikely that any two non-identical files in the real world will have the same MD5 hash, unless they have been specifically created to have the same hash.