Create creates an sftp backend as described by the config by running "ssh" with the appropriate arguments (or cfg.Command, if set).

Join joins the given paths and cleans them afterwards.

Open opens an sftp backend as described by the config by running "ssh" with the appropriate arguments (or cfg.Command, if set).

ParseConfig parses the string s and extracts the sftp config.

Config collects all information required to connect to an sftp server.

SFTP is a backend in a directory accessed via SFTP.