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I've got hundreds and hundreds of wireless password alerts on my desktop (possibly related to repeated request for wireless password, no wireless connection) -- while I troubleshoot the source of the alerts I'm wondering if there's a clean way to just cancel them all?

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Try this command: kill $( xprop | grep _NET_WM_PID | grep -o [0-9]*$ )
(it will kill the next clicked windows' process)

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