cpu_monitor_log.sh

#!/bin/bash

# Configuration
THRESHOLD=90
LOG_FILE="/tmp/cpu_high_usage.log"

while true; do
  # Get current CPU idle percentage and calculate usage
  # We use 'top' in batch mode to get a reliable snapshot
  CPU_USAGE=$(top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1}')

  # Check if usage is greater than or equal to threshold
  if (( $(echo "$CPU_USAGE >= $THRESHOLD" | bc -l) )); then
    echo "--- High CPU Detected: $(date) ---" >> $LOG_FILE
    echo "Total CPU Usage: $CPU_USAGE%" >> $LOG_FILE
    
    # Record the top 5 CPU consuming processes
    echo "Top Processes:" >> $LOG_FILE
    ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head -n 6 >> $LOG_FILE
    
    echo "-----------------------------------" >> $LOG_FILE
  fi

  # Wait 5 seconds before checking again
  sleep 5
done