Idea:

The ping utility normally pings the destination once per second until ^C is pressed, at which point it prints a summary of avg RTT and loss-rate and then exits. When tracking long-term network problems, it would be useful if pressing ^C would continue to print these statistics, but then continue pinging the destination; ^C^C would exit the utility. It would also be handy if the statistics on ^C included both cumulative values, and values since the last time ^C was pressed.