"http://" is only used to access your site with a web browser. In Telnet/SSH, it's all folders and files, like on your local hard drive.
You can specify the source & destination directories starting at the root directory "/" like this:
cp /big/dom/xyouraccount/somedirectory /big/dom/xyouraccount/www
If the directory doesn't begin with a "/", it is relative to your current directory (type "pwd" to find out), like this:
cp somedirectory www
You can look at the FQ Knowledge Base article Common Unix/Linux Commands Used Via Telnet/SSH
for more info.
You can also use the CNC File Manager to copy, move, create and delete files and directories.