How to make a custom button with an sh command?

Setup, Configuration and Use Runtime
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6

To get a button instead of a switch, use mappings in the sitemap in combination with autoupdate=“false”.
.items:

Switch MyButton "My Button" {exec="ON:'some command'",autoupdate="false"}

.sitemap:

Switch item=MyButton mappings=[ON="GO!"]

This would draw a button instead of a switch, the button will be labeled “GO!”. No need for resetting the button, as autoupdate="false" prevents OH to update the state of the underlying switch.
You could also draw more than one button (especially when using a Number item):

Switch item=MyNumberButton mappings=[1="One",2="Two",3="Three"]