Sorry again! You are right, I could have done that myself.
What I then found out further is that Billy Boy offers a free (?) program: "Visual Studio 2022" to open it.
Any other idea than going to a neighbour and looking it up on his machine?

Are there other possibilities within Linux?
Sqlite3 just give cryptic characters ... as i mentioned above.

It might be that these are useless temp files, right.
But as it is named "recover" (i myself would not name a recover file "recover" but Sicherung or something like that) I suspect it might be something I should store.
It could be something from the time I ran "teams" on my machine for my sons home schooling period during corona-times.
("teams" did a lot of uncontrollable things and was not -as promised- running  within Firefox alone, crashed several times and was then removed, last time I ran one of Billy's products)
Thanks

>what does `file xyz.db` say? creation date?

-rw-r--r-- 1 root root 4294967295 Jul  6  2020
(Can't remember what I could have done three years ago to create them)

>could be a db backup, or something else. do you have a database server running on that system?

No, just a normal pc, no database server (as far as I know)
[UPDATE] I tried to open one of the files using sqlite3. But no hint about the content, only a long row of
-- unrecognized token " "
-- syntax error
-- and unreadable characters
runs about 15 minutes

LibreOffice doesn't know to open it (or better said I don't know how to make LibreOffice open it)

Well,
;-))
good answer!
Whenever I had to do with
-- Billy Boy's products (I do not use them personally since 1995)
--  people using Billy Boy's products
it is as you say:
strange language (translated into german even worse!)
incredible fear of not getting paid as wanted
therefore complete silly security ideas for unimportant areas
bad security concepts, where it would be necessary to have good ones.

People using it seem to have undergone some kind of brain washing (no wonder).

Anyway, my daughter spent money on that game ! And she was not d'accord, that Billy bought minecraft.

How do I find out, what old hardware means?
How can I test if OpenGl4.4 will run?
My daughter's machine:
CPU:
  Topology: Quad Core model: Intel Core i5-3470 bits: 64 type: MCP
  L2 cache: 6144 KiB
  Speed: 1597 MHz min/max: 1600/3600 MHz Core speeds (MHz): 1: 1614 2: 1628
  3: 1635 4: 1628

inxi -m
  System RAM: total: 15.52 GiB used: 1.48 GiB (9.6%)

There is another one:

RAM :7,66GiB

CPU:
Intel Core i7-6500U 64 bits 3000 Mhz

Thanks in advance

It is the first line in every terminal I open:

ash: 0: Can't open completion

GNOME-Terminal 3.30.2
Desktop: Cinnamon 3.8.8
Distro: Devuan GNU/Linux 3 (beowulf)

By right-clicking  under "edit" I get a window (launcher properties) with the following entries:

Name: Terminal
Command: gnome-terminal  (with a button "Browse" which opens a file manager)
Comment: Use the command line
there is a tickable box "Launch in Terminal? (not checked)

If I run  "gnome-terminal" (in a GNOME-Terminal) I get a new terminal (including :"ash: 0: Can't open completion" as first line).

If I stop that terminal with CTRL +D, the original terminal displays:

# Couldn't register with accessibility bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
# watch_fast: "/org/gnome/terminal/legacy/" (establishing: 0, active: 0)
# unwatch_fast: "/org/gnome/terminal/legacy/" (active: 0, establishing: 1)
# watch_established: "/org/gnome/terminal/legacy/" (establishing: 0)

All above as user!

If I switch to root and try to run "gnome-terminal"

I get this error (and NO new terminal-window!):

# Error constructing proxy for :1.98:/org/gnome/Terminal/Factory0: Verbindung ist geschlossen
# Failed to use specified server: Verbindung ist geschlossen
# Falling back to default server.
# Error constructing proxy for org.gnome.Terminal:/org/gnome/Terminal/Factory0: Verbindung ist geschlossen

"Verbindung ist geschlossen" means: "connection closed"

Thanks for your patience!

You wrote:

Same with me!
I do get an error message, when I open an console.

I installed ascii from a netinstall iso. Upgraded to beowulf by replacing "ascii" in my sources.list

;-)
well I really don't know. It all started when I upgraded from ascii to beowulf.
Since then I got

bash: ash: command not found

whenever I open a console.
After installing "ash" I get

ash: 0: Can't open completion

Me neither.
Perhaps we ask the guys who develop ash/dash?
greetings

@fsmithred
thanks for answering ...
sorry, I found out that ash was NOT installed. So I installed it (again? I am really not quite shure)
I don't remember exactly what kind of prompt-behaviour I had, before I did that su alias.
Before installing ash I deleted that empty ash file.
/bin looks like this now:

ls -l *ash
lrwxrwxrwx 1 root root       4 Jan 17  2019 ash -> dash
-rwxr-xr-x 1 root root 1168776 Apr 18  2019 bash
-rwxr-xr-x 1 root root  121464 Jan 17  2019 dash
lrwxrwxrwx 1 root root       4 Apr 18  2019 rbash -> bash

NOW opening a console, I get:

ash: 0: Can't open completion 

Thank you! Feels good you are there!

@steve
yes, there is a root password!

@ralph
I can't reproduce the problem anymore (puuh, saved)

su -
su --login

and

su

all demand a password. (Everywhere, also on a non grafic console. "ctrl-alt-f1").
Sent securrity home again.
-----------------------------------

su -

and

su --login

with output

-bash: ash: Kommando nicht gefunden.

(command not found)

-----------------------------------------------------
Only

su

(after setting alias)

alias su='su -'

does NOT output

-bash: ash: Kommando nicht gefunden.

but silently opens a root-shell

root@someone:/home/someone# 

------------------------------------------------------
Remains the "ash output".
Couldn't find much in the web:
https://en.wikipedia.org/wiki/Almquist_shell
https://www.in-ulm.de/~mascheck/various/ash/
which leaves me as ignorant as before.

greetings

Hi Ralph,
thanks for the answer!
1)
Well my "su" still works fine. I was a bit of confused that I should work from now on with "su -". But I tried it with "command not found" result.
Why should I check up why "su -" is not working, when "su" is working as usual? Btw I have no idea how to check up why I get that "ash" output.
Any suggestions?

2)
Being able as normal user to get a root-shell by just typing su "--login" without need for a password  makes me a little nervous.
Not you?
greetings