mcrcon VS mcmap

This could possibly be done with Skript using yaml to tell it what to do on startup or shutdown. Although I would personally prefer using RCON like u/Mutated_Zombie mentioned. There exists cmd execs you could use in a batch script.

If you can't find a tool to do it the way you're looking for, my approach would be to install mcrcon on the server and then SSH to the server and run the commands to grant OP via the terminal. (Plenty of SSH clients for the phone, if you need to do it remotely.)

Note that if you run MC this way, you need to connect via RCON, via something like mcrcon.

Why would I use this over mcrcon?

You can use rcon to run commands and filter the output. It's not pretty, but it doesn't require any kind of external service (also you need to write the scripts yourself).

https://github.com/Tiiffi/mcrcon this is the rcon tool.

There's no easy answer to this. To do what you're looking to do, you're gonna need to write some code, either a separate plugin that hooks into their API (if they have one), a custom version of that plugin built from source with your own changes (if their code is available publicly), or otherwise some clever business with some sort of external tools (maybe mcrcon?) and some scripting language like bash or python.

If running on Linux, you could use a use mcron and add that to the systemd script

yep this works. I personally use https://github.com/Tiiffi/mcrcon in my scripts

use mcrcon

I used a slightly modified version of https://github.com/WRIM/mcmap/releases (I modified it to properly render blocks in TMCW, as well as improved the algorithm used to only render explored caves, which is the most unique feature of this mapping tool). A more up-to-date version can be found at https://github.com/spoutn1k/mcmap/releases (this is actually the original repository, unfortunately, they removed downloads for older versions, and it is 1.13+ only).

Otherwise, the Wiki has a list of mapping tools but none seem to go back to Beta versions and one of the only ones that I know was around back then is no longer available in that form unless it was archived somewhere (MCMap, which has a forum thread for a Mac OS port from 2010 (last updated in 2012) but the original thread is no longer accessible, and was updated to 1.3.1 the last I remember, and the latest version doesn't even support pre-1.13 versions and the original GitHub doesn't list anything older, there are numerous forks but I'm not sure if any are old enough (the oldest I've looked at go back 10 years and mention 1.2, which are unlikely to support older versions due to the Anvil file format update in that version), and many don't have releases).

You could use a program like mcmap. It creates a 3D map of your world. This is usually cool if you just want a cool looking map of your world, but I guess it could also be great if youre just trying to find your old base.

You can try it with precompiled versions on github. They work in the powershell/terminal, and there is a windows interface available here: https://github.com/spoutn1k/mcmap/discussions/63.