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You don't need a handler for what you want.

Here is an example that creates a led connected to 'halui.machine.is-on' and a button connected to 'halui.machine.on'  

 

 

par contre , j 'ai changer les ligne de [axis_a] a [joint3]  et linux demarre sans erreur ,mais le frein ne fonctionne pas , une idee?

merci pour la reponse , quand je retire emcmot , j 'ai cette erreur.

A small shell script
download the file and open the directory (containing the file)in a terminal 

You can delete the files when done.

I recently completed a wire EDM machine (not my design) and LinuxCNC runs it, and though I have a sw background, I have zero experience with it.
The very first job it's running, "First Cut" is very simple, checking that the hardware works, powering everything up, making a simple straight cut, then backing out and powering everything down. Because of all the new hardware, I want to single-step through this short job. See below.
The issues:
There are two buttons, "Run" and "Step." I first tried repeatedly pressing Stop and it seemed to work at first, but after about the fourth press, the program took off as though I'd pressed Run. An online reference (AI generated) said to press Step once, then repeatedly press Run, which will advance one line of G-code at a time. Thing is, when I press Step, Run grays out and cannot be pressed, so I don't understand (hence why I pressed Step repeatedly.)
On a related note, when pressing Step, I expected LinuxCNC to indicate the line of G-code that's being executed, but it does not. It's possible that's because I'm not using Step correctly, that it's never being activated, but I don't know.
Lastly, after pressing Step once or twice (don't remember), I get the following error message: "Cannot use axis values without a G code that uses them." I don't know what this means. [Edit: looking online, it appears that this is due to the line "X20" appearing along by itself, with no G-code ahead of it. A puzzle is how the program advanced all the way to the X20 line when I only pressed Step a couple times...]

Thanks! 

PS: the last line of the attached file is G30 (it was on the following page)