Experimente watch . Na página de manual :
Name
watch- execute a program periodically, showing output fullscreenSynopsis
watch [-dhvt] [-n <seconds>] [--differences[=cumulative]] [--help] [--interval=<seconds>] [--no-title] [--version] <command>Description
watchruns command repeatedly, displaying its output (the first screenfull). This allows you to watch the program output change over time. By default, the program is run every 2 seconds; use-nor--intervalto specify a different interval.The
-dor--differencesflag will highlight the differences between successive updates. The--cumulativeoption makes highlighting "sticky", presenting a running display of all positions that have ever changed. [...]
watchwill run until interrupted.
Note que "tempo real" teria que ser aproximado por "uma vez por segundo" (por exemplo) aqui ...