I prefer simple and portable shell scripts too. While I use here documents a bunch too this is the first time I've seen this idiom:

    #!/bin/sh
    tail -n +3 <current-filename> | ssh -p 1234 root@myserver_ip  ; exit
    set -eu
    ...

Clever.

When you write `install`, is this another script that you have installed on the server beforehand or is it a function/alias or something? [EDIT: Duh, didn't realize this was actually a standalone program (standard but non-POSIX AFAICT) I haven't used.]