How to: SSH Subsystems
The SSH protocol supports calling subsystems with the `-s` flag. In RSSH this is repurposed to provide special commands for platforms, and `sftp` support.

#### All

`list`  Lists avaiable subsystem

`sftp`: Runs the sftp handler to transfer files

#### Linux

`setgid`:   Attempt to change group

`setuid`:   Attempt to change user

#### Windows
`service`: Installs or removes the rssh binary as a windows service, requires administrative rights

e.g

```sh