折腾：
【已解决】命令行中ftp操作上传到远程服务器crifan.com
期间，想要删除文件夹，看了命令去用rmdir，结果还是不行：
sftp> rmdir http_restful_api
Couldn’t remove directory: Failure
sftp> pwd
Remote working directory: /home/wwwroot/book.crifan.com/books
sftp> ls -la
drwxr-xr-x 4 root root 4096 Dec 14 14:44 .
drwxr-xr-x 5 www www 4096 Dec 6 16:19 ..
drwxr-xr-x 6 root root 4096 Dec 19 22:43 http_restful_api
drwxr-xr-x 6 root root 4096 Dec 7 09:06 http_summary
sftp> rmdir http_restful_api
Couldn’t remove directory: Failure
搜：
sftp rmdir Couldn’t remove directory: Failure
linux – why is sftp rmdir not working? – Super User
先要删除文件夹下所有文件，成为空文件夹，然后rmdir才能删除
结果郁闷了，因为想要删除文件夹中内容，结果子文件夹也非空，无法删除：
sftp> cd /home/wwwroot/book.crifan.com/books/http_restful_api
sftp> pwd
Remote working directory: /home/wwwroot/book.crifan.com/books/http_restful_api
sftp> ls -la
drwxr-xr-x 6 root root 4096 Dec 19 22:43 .
drwxr-xr-x 4 root root 4096 Dec 14 14:44 ..
drwxr-xr-x 2 root root 4096 Dec 14 14:38 epub
-rw-r–r– 1 root root 26033916 Dec 19 22:45 http_restful_api.zip
drwxr-xr-x 2 root root 4096 Dec 14 14:38 mobi
drwxr-xr-x 2 root root 4096 Dec 14 14:38 pdf
drwxr-xr-x 10 root root 4096 Dec 14 14:38 website
sftp> rm /home/wwwroot/book.crifan.com/books/http_restful_api/*
Removing /home/wwwroot/book.crifan.com/books/http_restful_api/epub
Couldn’t delete file: Failure
Removing /home/wwwroot/book.crifan.com/books/http_restful_api/http_restful_api.zip
Removing /home/wwwroot/book.crifan.com/books/http_restful_api/mobi
Couldn’t delete file: Failure
Removing /home/wwwroot/book.crifan.com/books/http_restful_api/pdf
Couldn’t delete file: Failure
Removing /home/wwwroot/book.crifan.com/books/http_restful_api/website
Couldn’t delete file: Failure
sftp> rm -r /home/wwwroot/book.crifan.com/books/http_restful_api
rm: Invalid flag -r
才发现别人说的：
because the -rf flag does not exist for rm in sftp.
Recursive remove directory using SFTP – codesd.com
说是可以mount远程路径到本地，然后再去删除
sftp delete folder recursively
python – Recursive remove directory using SFTP – Stack Overflow
通过python的paramiko去删除
recursive delete with sftp? – Unix & Linux Stack Exchange
也可以用lftp去删除
LFTP – sophisticated file transfer program
Recursively delete directory with JSch on SFTP with Java – larshaendler.com
How to delete folder recursively on remote server using SFTP in java?
#7813 (Deliting files recursively SFTP) – FileZilla
SFTP: Remove Non-Empty Directory? – Chilkat Forum
【总结】
sftp协议中，rm就不支持-r的递归删除。
rmdir只能删除空目录。
-》
如果想要递归删除非空目录，则：
办法1:映射远端路径到本地，本地再用rm -rf递归删除（远端的路径）
办法2:用lftp去递归删除
办法3:（此处）直接用rsync实现文件同步的目的，就规避了sftp无法递归删除非空目录的问题
-》最终用rsync完成了本地文件同步到远程服务器的事情。很是方便。
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