To give an example, I run series of commands which would output a number. I must show this on the GNOME panel. Font, color, size etc doesn't matter. I just need a small display on the panel.
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There are a couple of extensions you might want to have a look at.
- Top Bar Script Executor
Adds buttons to the top bar that execute scripts or commands.
- Command Output
Display the output of a shell command at a user-specified interval.

pomsky
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There's Executor that seems to be actively maintained : https://extensions.gnome.org/extension/2932/executor/. Tested, works fine (Gnome 3.38). – ChennyStar Oct 22 '23 at 16:15
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Executor by raujonas, logo has a Sigma sign on it
does exactly what you want - I use it to ping a server and display and Up/Down arrow in the panel. Install via https://extensions.gnome.org/ or use Tweaks > extensions

Crighton
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indicator-sysmonitor
– WinEunuuchs2Unix Aug 05 '18 at 21:57