class walk_method :This FTP method walks to the target directory:[ `Dir of string | `File of string | `Stay ] ->
ftp_method
`File name
: The name
is interpreted as slash-separated path.
It is always interpreted relative to the home directory of the
user (i.e. the directory after login), even if it begins with a
slash. The FTP command walks to the directory containing name
.`Dir name
: The FTP command walks to the directory name
(same
syntax as for `File
).`Stay
: The FTP command does nothing (stays in the current directory).