文件完整性的哈希验证

可以通过“nc”命令实现文件传输，通过“md5sum”完成文件完整性验证。

OpenWrt

root@openwrt:/tmp# md5sum firmware

Ubuntu/CentOS

qige@ubuntu:~$ md5sum firmware

Macos

localhost:Downloads qigezhao$ md5 openwrt-and-me.pdf 
MD5 (openwrt-and-me.pdf) = 5161d4ab8ab3560f8959f4619e292917
localhost:Downloads qigezhao$

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