Shell Script For CPU Usage Tracker Script

Linux Shell Script For CPU Usage Tracker Script 

CPU Usage Tracker Script

#!/bin/bash

output_file="cpu_usage_log.txt"

# Log current CPU usage to a file with timestamp

echo "$(date) $(top -bn1 | grep 'Cpu(s)' | awk '{print $2}' | cut -d.

-f1)%" >> "$output_file"

echo "CPU usage logged."

Shell script to track CPU usage can be helpful for monitoring system performance over time or for diagnosing issues related to resource consumption

#!/bin/bash

# Function to get CPU usage percentage

get_cpu_usage() {

    CPU_USAGE=$(top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1}')

    echo "Current CPU Usage: $CPU_USAGE%"

}

# Main loop to track CPU usage

while true; do

    get_cpu_usage

    sleep 5  # Adjust sleep duration (in seconds) as needed

    clear   # Comment this out if you don't want to clear the screen after each update

done

Explanation:

1. Shebang: #!/bin/bash specifies that this script should be interpreted using the Bash shell.

2. get_cpu_usage Function: Uses top command to get CPU usage information:

   • -bn1: Runs top in batch mode for one iteration.
   • grep "Cpu(s)": Filters lines containing CPU usage information.
   • sed "s/.*, *\([0-9.]*\)%* id.*/\1/": Extracts the CPU idle percentage.
   • awk '{print 100 - $1}': Calculates and prints the CPU usage percentage by subtracting idle percentage from 100.

3. Main Loop: Continuously calls get_cpu_usage function in a loop.

   • Adjust the sleep duration (in seconds) as needed to control how frequently CPU usage is checked.
   • clear: Clears the screen after each update to show fresh CPU usage information. Comment out this line if you prefer not to clear the screen.

Usage:

• Save this script to a file, e.g., track_cpu_usage.sh.
• Make it executable with chmod +x track_cpu_usage.sh.
• Run the script with ./track_cpu_usage.sh.

Notes:

• Customization: You can modify the script to output CPU usage to a log file instead of printing to the screen. This might involve redirecting the output of get_cpu_usage to a file (echo "$(get_cpu_usage)" >> cpu_usage.log).

• Enhancements: Depending on your needs, you might add functionality to monitor specific processes or thresholds and trigger alerts or actions based on CPU usage.

• Resource Impact: Continuous monitoring scripts like this can consume resources (CPU, memory). Ensure it doesn't interfere with other critical processes or impact system performance significantly.

This script provides a basic framework for tracking CPU usage in a Unix-like environment using standard command-line tools (top, grep, sed, awk). Depending on your requirements, you can expand upon it to include more detailed monitoring or integrate with monitoring systems for broader system management.