(Bad) bash script to start and stop zend a bunch of times

zentester.sh

#!/usr/bin/env bash

SLEEPY=30
ZEND="/home/smrtz/Builds/zen/src/zend --datadir=/home/smrtz/zen_test_datadir"
ZENCLI="/home/smrtz/Builds/zen/src/zen-cli --datadir=/home/smrtz/zen_test_datadir"
TESTNUM=60

for I in {0..$TESTNUM}; do
    echo "TEST NUMBER: "$I
    # Start zend and grab PID
    $ZEND && sleep 0.5 && ZEN_PID=$(cat /home/smrtz/zen_test_datadir/zend.pid)
    echo "ZEN_PID: " $ZEN_PID

    # Make sure zend is ready
    while true; do
        if $ZENCLI getinfo 2> /dev/null | grep -q "connections"; then
            echo "zend ready, sleeping for "$SLEEPY"s"
            break
        fi
    done

    # Sleep, then print new block height
    sleep $SLEEPY
    $ZENCLI getchaintips | grep height

    # Stop zend, unlock PID if it's failed for 5 seconds...
    $ZENCLI stop
    VAR=0
    while true; do
        if ! ps -p $ZEN_PID > /dev/null; then
            sync
            sync
            break
        else
            sleep .5
            ((VAR++))
            if [ VAR \> 10 ]; then
                kill -9 $ZEN_PID
            fi
        fi
    done
    
    
    sleep 0.5

# Close for loop
done