shell script question

Question: Create a shell script that monitors the CPU and memory usage on a Linux system and logs any usage over 80% to a file.

 #!/bin/bash

LOG_FILE="/var/log/system_health.log"

# Function to check CPU usage
check_cpu() {
   CPU_USAGE=$(top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1"%"}')
   CPU_USAGE_VAL=$(echo $CPU_USAGE | sed 's/%//')
   if (( $(echo "$CPU_USAGE_VAL > 80" |bc -l) )); then
       echo "$(date): High CPU usage detected: $CPU_USAGE" >> $LOG_FILE
   fi
}

# Function to check memory usage
check_memory() {
   MEM_USAGE=$(free | grep Mem | awk '{print $3/$2 * 100.0}')
   if (( $(echo "$MEM_USAGE > 80" |bc -l) )); then
       echo "$(date): High Memory usage detected: $MEM_USAGE%" >> $LOG_FILE
   fi
}

# Main monitoring function
monitor_system() {
   while true; do
       check_cpu
       check_memory
       sleep 60
   done
}

# Start monitoring
monitor_system