Repeat a bash command from https://stackoverflow.com/a/41191408/3486675 e.g. repeat_command.sh "kubectl get pods --all-namespaces"

repeat_command.sh

#!/bin/bash
while true; do
  # COMMAND=$(kubectl get pods --all-namespaces) #Save command result in a var.
  COMMAND=$($1) #Save command result in a var.
  echo "$COMMAND" #Print command result, including new lines.

  sleep 3 #Keep above's output on screen during 3 seconds before clearing it

  #Following code clears previously printed lines
  LINES=$(echo "$COMMAND" | wc -l) #Calculate number of lines for the output previously printed
  for (( i=1; i <= $(($LINES)); i++ ));do #For each line printed as a result of COMMAND"
    tput cuu1 #Move cursor up by one line
    tput el #Clear the line
  done

done