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#!/bin/bash EXEC="/usr/local/bin/messengerfordesktop" exec -a "$0" "$EXEC" $params & pid=$! while [ -z $winid ] do winid=$(xwininfo -name "Messenger" 2> /dev/null | grep "Window id:" | grep -Eio "0x[a-z0-9]+") done xprop -id ${winid} -f WM_CLASS 8s -set WM_CLASS "MessengerForDesktop" wait $pid