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md5sum命令用于生成和校验文件的md5值。它会逐位对文件的内容进行校验，它是常用与检查文件的完整性。
读取文件的MD5值
[root@new ~]# md5sum /usr/local/sbin/* >>file.md5 [root@new ~]# cat file.md5 74fd7e1f2730b5f8353d7a5f417747ef /usr/local/sbin/demo.sh 8bd8f8743b02a33882bca8fcb2234261 /usr/local/sbin/array.sh d7e30c2d897f0fdd9b157e9a5e9fbfbc /usr/local/sbin/debug.sh
检查文件是否完整
[root@new ~]# md5sum -c file.md5 /usr/local/sbin/array.sh: OK /usr/local/sbin/debug.sh: OK /usr/local/sbin/demo.sh: OK
[root@new ~]# echo $?
0
测试改变一个文件
[root@new ~]# md5sum -c file.md5 /usr/local/sbin/array.sh: OK /usr/local/sbin/debug.sh: OK /usr/local/sbin/demo.sh: FAILED md5sum: WARNING: 1 of 3 computed checksums did NOT match [root@new ~]# echo $? 1
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原文地址：http://www.cnblogs.com/zydev/p/5791734.html
