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Learn how to filter CPU consuming jobs based on runtime and utilization in a Linux shell script!
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Check if File Content is More Than 5 Minutes: A Linux Shell Script Solution

When working with system processes and monitoring their CPU utilization, you may find yourself needing to filter and analyze the output data effectively. One common challenge is determining whether certain entries surpass a specified duration—like five minutes—while also meeting other criteria such as high CPU utilization. In this guide, we will guide you through a straightforward solution to identify CPU consuming jobs that exceed both 75% utilization and a runtime of over 00:05:00, using a Linux shell script.

Understanding the Problem

You are collecting data from processes and storing it in a formatted text file. Here's an example of what a line in your file might look like:

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The second value (4.1) represents CPU utilization.

The sixth value (00:00:01) represents the time taken by that process.

Your goal is to filter the file for entries where:

CPU utilization is greater than or equal to 75%,

The time taken is more than 5 minutes.

However, you've encountered issues with comparing time values correctly. In particular, your existing conditions are not functioning as intended, particularly with the time comparison.

The Solution: Step-by-Step Guide

1. Improve File Handling

To start, let's enhance how you retrieve the filename. Instead of using ls, you should use a command that directly points to your file. This eliminates unnecessary overhead and potential issues:

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2. Use a More Efficient Loop

Using a while loop is usually more efficient than cat in conjunction with for. This change will help streamline the process:

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3. Comparing Time Values

For effective time comparison, utilize a conversion method to compare seconds since epoch. First, you need to establish your threshold time of 5 minutes:

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Next, extract the time taken from each line and convert it:

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4. Implementing the Final Logic

Now, you can implement the main filtering logic to check if both conditions are met—CPU utilization and time taken:

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Full Script Example

Putting all these pieces together, your complete script will look like this:

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Conclusion

By applying these changes, you can effectively filter through your process data, ensuring that you're capturing only those entries that meet your specific criteria for CPU utilization and operational time. These practices not only improve the performance of your script but also provide clearer logic flow for ease of maintenance and debugging.

Now you can confidently grab the highest CPU-consuming jobs that run longer than five minutes—helping you optimize system performance efficiently!