watch command allows you to continuously run any Linux command in fullscreen. It also allows for changing the timing between the command runs as well as highlighting the differences between each run.
-n option to set the interval in seconds between each running of the command. (
-n0 sets the interval to .1 seconds, which is the fastest available refresh rate; the default interval is 2 seconds and the longest interval is 4294 seconds)
--differences option to highlight the changes between command runs.
cl-rctl ip route
This command displays the Cumulus Linux routing table.
watch -n0 --differences sudo cl-rctl ip route
ip -s link show up
This command displays interface packet counters.
watch -n0 --differences sudo ip -s link show up