前几天七牛云的绑定随机域名到期了，博客中的图片链接全部失效了。然而Github的泛子域名由于众所周知的原因无法在公信部备案，本想换个图床，但是七牛云的对象存储不能直接下载。在官网发现了qshell的教程。
下载与安装
由于qshell是由go编写的，七牛云已经在官网提供了编译好的二进制文件,下载文件包并从中选择适合自己操作系统的文件。将选择好的文件重命名为qshell，因为只是用于下载图片就不必要将qshell加入环境变量中了。在qshell的目录打开终端，输入
$ ./qshell如果输出qshell使用指南就表示可以使用了
Qiniu commandline tool for managing your bucket and CDN
Usage:
qshell [command]
Available Commands:
account Get/Set AccessKey and SecretKey
alilistbucket List all the file in the bucket of aliyun oss by prefix
b64decode Base64 Decode, default nor url safe
b64encode Base64 Encode, default not url safe
batchchgm Batch change the mime type of files in bucket
batchchtype Batch change the file type of files in bucket
batchcopy Batch copy files from bucket to bucket
batchdelete Batch delete files in bucket
batchexpire Batch set the deleteAfterDays of the files in bucket
batchfetch Batch fetch remoteUrls and save them in qiniu Bucket
batchmove Batch move files from bucket to bucket
batchrename Batch rename files in the bucket
batchsign Batch create the private url from the public url list file
batchstat Batch stat files in bucket
buckets Get all buckets of the account
cdnprefetch Batch prefetch the urls in the url list file
cdnrefresh Batch refresh the cdn cache by the url list file
chgm Change the mime type of a file
chtype Change the file type of a file
completion generate autocompletion script for bash
copy Make a copy of a file and save in bucket
d2ts Create a timestamp in seconds using seconds to now
delete Delete a remote file in the bucket
dircache Cache the directory structure of a file path
domains Get all domains of the bucket
expire Set the deleteAfterDays of a file
fetch Fetch a remote resource by url and save in bucket
fput Form upload a local file
get Download a single file from bucket
help Help about any command
ip Query the ip information
listbucket List all the files in the bucket
listbucket2 List all the files in the bucket using v2/list interface
m3u8delete Delete m3u8 playlist and the slices it references
m3u8replace Replace m3u8 domain in the playlist
mirrorupdate Fetch and update the file in bucket using mirror storage
move Move/Rename a file and save in bucket
pfop issue a request to process file in bucket
prefop Query the pfop status
privateurl Create private resource access url
qdownload Batch download files from the qiniu bucket
qetag Calculate the hash of local file using the algorithm of qiniu qetag
qupload Batch upload files to the qiniu bucket
qupload2 Batch upload files to the qiniu bucket
reqid Decode qiniu reqid
rpcdecode rpcdecode of qiniu
rpcencode rpcencode of qiniu
rput Resumable upload a local file
saveas Create a resource access url with fop and saveas
stat Get the basic info of a remote file
sync Sync big file to qiniu bucket
tms2d Convert timestamp in milliseconds to a date (TZ: Local)
tns2d Convert timestamp in Nanoseconds to a date (TZ: Local)
token Token related command
ts2d Convert timestamp in seconds to a date (TZ: Local)
unzip Unzip the archive file created by the qiniu mkzip API
urldecode Url Decode
urlencode Url Encode
user Manage users
version show version
Flags:
-C, --config string config file (default is $HOME/.qshell.json)
-d, --debug debug mode
-h, --help help for qshell
-L, --local use current directory as config file path
-v, --version show version
Use "qshell [command] --help" for more information about a command.
如果出现Pressmission Denied，则使用chmod命令赋予qshell文件权限即可。
新建对象存储
重新选择一个新的对象储存，注意新建对象储存的地理位置要和原对象储存保持一致。
下载图片
首先在qshell中使用account命令配置七牛云账户的AccessKey和SecretKey。
$ qshell account ak sk name其中name表示该账号的名称, 如果ak, sk, name首字母是”-“, 需要使用如下的方式添加账号, 这样避免把该项识别成命令行选项:
$ qshell account -- ak sk name然后使用batchcopy命令，获取原对象储存的完整文件列表：
$ qshell listbucket bucketname -o list.txt其中bucketname是原存储空间名称,将刚刚获取到的list.txt复制到excel里，保留第一列到新的文件name.txt
批量复制文件至新对象储存：
// qshell batchcopy -y <SrcBucket> <DestBucket> [-i <SrcDestKeyMapFile>] [flags]
$ ./qshell batchcopy -y blogimage qudai -i name.txt其中加入-y选项不需要输入验证码，
批量下载，使用qdownload命令确认复制是否成功
// [<ThreadCount>]: 同时下载文件数量（1-2000），默认为5
// <LocalDownloadConfig>: 配置文件，如tmp.conf
// qshell qdownload [<ThreadCount>] <LocalDownloadConfig> [flags]
$ ./qshell qdownload tem.conf在qshell所在的文件目录新建配置文件，以.conf为后缀，内容：
/*
dest_dir 下载文件存储目录。wins下目录示例 D:\\jemy\\backup，尽量不要出现中文，否则涉及编码问题
bucket 新建存储空间的名称
suffixes 下载文件的后缀
cdn_domain 新建存储空间的CDN测试域名，可在新存储空间页面查看
*/
{
"dest_dir" : "<LocalBackupDir>",
"bucket" : "<Bucket>",
"suffixes" : ".png,.jpg",
"cdn_domain" : "down.example.com"
}然后在指定目录就会生成一个新的目录存放文件，等待下载完成即可。
