how do we get detailed information of an sftp command?
for example when you type help on sftp, you get the available commands and their brief descriptions. What if you want to get detailed usage information, for example when you want to know what the command line options do..?
in unix, we do
$man command
..and it gives all details of the command. how do we accomplish this in sftp.
That's how far you can go with the sftp client you are using.
The ftp you are using is another different client (program) and the developers decided to code a bit friendlier help at the prompt, but that does not guarantee that every ftp client would have the same feature, nor that the sftp client would, neither. That's why you must read the documentation before you use it.