istio-progress-bar.sh

#!/bin/bash
TOTAL=$(istioctl proxy-status | tail -n +2 | awk '{print $7}' | wc -l)

prog() {
    local w=100 p=$1;  shift
    pct="$(( $p*$w/$TOTAL ))"
    printf -v dots "%*s" "$pct" ""; dots=${dots// /.};
    printf "\r\e[K|%-*s| %3d %%" "$w" "$dots" "$pct";
}

while :
do
  CURRENT=$(istioctl proxy-status | awk '{print $7}' | grep "1.6.12" | wc -l)
  prog "$CURRENT"
  if [ "$CURRENT" = "$TOTAL" ]; then
    echo ""
    echo "Voilla"
    exit 0
  fi
  sleep 10
done