Toolbar buttons tutorial UPDATE - suggestions

[PlanetCNC]

We are in the middle of update of tutorial for toolbar buttons, and at the end of the document I am adding various examples, focusing on the controller output pin and ExtInOut output pin control.
We would be grateful for any feedback, suggestions and maybe requests.

Buttons tutorial

Thank you, PlanetCNC

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[ScorpionTDL]

Looking good so far.

I would like to see some detailed explanation on the syntax that can be used for the expressions.
For example I did not know that something like
if(_output & 1,_output= _output & ~1,_output= _output | 1)
is possible.
While the syntax looks quiet straight forward, an additional deception of the syntax would be welcome and if any other commands are available as well.

[retro1]

Where can i find the txt-file in Linux? I want to get rid of some buttons as i only use it in 2D.