LastThing

• TAR - Remove leading directories when extracting from a tar archive:

tar --strip-components=NUMBER

• Reverse X11 forwarding

See askubuntu/reverse-x11-forwarding:

"reverse ssh tunnelling" or "remote port forwarding" is your friend.

on the phone:

ssh -f -N -X -R 5555:localhost:22 desktop_user@desktop

then, on the desktop this

ssh -X -p 5555 phone_user@localhost