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How to Get Wifi Signal Strength via CLI using nmcli on Fedora or Ubuntu
(blog.benyamin.xyz)
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Why don't you have an applet or something instead?
Because the machine could be headless so it can't display the applet to click on
It's as other said, headless. Sometimes I only need to check if the signal strength is alright, as I use that machine as servers and host several service on it.