To upload to an FTP server, you specify the entire target file path and name
in the URL, and you specify the local filename to upload with -T, --upload-file. Optionally, you end the target URL with a slash and then the
file component from the local path is appended by curl and used as the remote
filename.
Like:
curl -T localfile ftp://ftp.example.com/dir/path/remote-file
or to use the local filename as the remote name:
curl -T localfile ftp://ftp.example.com/dir/path/
curl also supports globbing in the -T argument so
you can opt to easily upload a range of files:
curl -T 'image[1-99].jpg' ftp://ftp.example.com/upload/
or a series of files:
curl -T '{file1,file2}' ftp://ftp.example.com/upload/
or
curl -T '{Huey,Dewey,Louie}.jpg' ftp://ftp.example.com/nephews/