Use watch to monitor a command at some frequency on Linux

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  1. Use watch with -n to watch a command ever 2 seconds. e.g. To watch top command with first 12 lines every 2 seconds:
    watch -n 2  '/usr/bin/top -b -n 1 -c | head -12'
  2. Check port availability every second
    watch -n 1 ‘nc -vz localhost 22; date’

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