就是希望 从别的机器上copy文件的是完整，不丢失的
具体资料我就不整理了，看些如下参考链接，大概也了解了参考链接如下：
http://serverfault.com/questions/289646/scp-is-a-checksum-required
http://serverfault.com/questions/316386/how-can-i-ensure-non-corrupt-file-transfer-in-linux
http://stackoverflow.com/questions/15787676/rsync-how-to-do-a-checksum-on-rsync
http://serverfault.com/questions/211005/rsync-difference-between-checksum-and-ignore-times-options
http://unix.stackexchange.com/questions/137445/scp-does-not-transfer-files-correctly
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