下载校验与命令行
MD5
d2334dbba7313e9abc8c7c072d2af09c
curl -O https://old-releases.ubuntu.com/releases/gutsy/ubuntu-7.10-server-i386.iso
# 校验文件完整性
md5sum ubuntu-7.10-server-i386.iso # 期望 d2334dbba7313e9abc8c7c072d2af09c