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  1. local sec, nsec;
  2.  
  3. while true do
  4. nsec = math.floor(os.clock())
  5.  
  6. if nsec ~= sec then
  7. sec = nsec
  8. print("Lua has been running for "..sec.." second(s).")
  9. end
  10. if sec == 5 then return end
  11. end
  12.  
Success #stdin #stdout 5s 2496KB
stdin
Standard input is empty
stdout
Lua has been running for 0 second(s).
Lua has been running for 1 second(s).
Lua has been running for 2 second(s).
Lua has been running for 3 second(s).
Lua has been running for 4 second(s).
Lua has been running for 5 second(s).