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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
And one more thing - there is a command-line app to do some other simple things for you too: https://www.npmjs.com/package/espruino
But if all you want to do is send commands, the echo is probably best :)