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'watch' repeatedly (default every 2 seconds, -n 1 => every second) runs a command (here ':', a shorthand for 'true'), displays the output (here nothing) and the date and time of the last run.
I thought it to be obvious but it seemingly is not: to exit use Ctrl-C.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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