(for practical needs, not building blocks)
See also: https://github.com/sarnobat/unix
(e.g. using antec) From host that doesn't have ssh:
autossh -M0 -p 222 -R 9001:localhost:22 [email protected]
rsync:
rsync -a -v -e 'ssh -t -p 222 [email protected] ssh -t -p 9001 WIN+sridhar@localhost ssh -t [email protected] ssh' [email protected]:/tmp/sarnobat_bashrc /tmp/test