Another approach to change kubectl context

chcluster2.sh

#!/bin/bash

set -e

function listContexts() {
    kubectl config get-contexts | sed -e 's/^ /off/' -e 's/^\*/on/' -e 1d | awk '{printf("%i\n%s\n", (NR-1),$2)}'
}

# https://stackoverflow.com/questions/11426529/reading-output-of-a-command-into-an-array-in-bash
IFS=$'\n' read -r -d '' -a contexts < <( listContexts && printf '\0' )

selected=$(
    dialog --menu "Choose cluster" 0 0 0 "${contexts[@]}" 2>&1 > /dev/tty 
)

if [ "x${selected}" != "x" ]; then
    selectedContextPos=$[ 2 * selected + 1 ]	
    selectedContext=${contexts[$selectedContextPos]}
    echo Changing to context ${selected} : ${selectedContext}
    kubectl config use-context ${selectedContext}
else
	echo "Nothing selected, not changing context"
fi