Скачать или смотреть How to Resolve the Integer Expression Expected Error in Your CPU Usage Bash Script

Learn how to fix the "integer expression expected" error in your Bash script for CPU usage monitoring. Resolve common issues related to string handling, `if` statements, and integer comparisons in Linux.
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Running into an integer expression expected error can be incredibly frustrating, especially when you're trying to monitor CPU usage through a Bash script. This common error typically arises from mishandling variables and their expected types within your script. Let's dive into diagnosing and fixing this issue.

Understanding the Error
The integer expression expected error usually indicates that a script is trying to perform an arithmetic operation on a non-integer value. This can occur in scenarios where you compare strings instead of integers within your if statements or arithmetic operations.

Common Scenarios

Improper Variable Assignment

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Ensure that CPU_USAGE indeed contains a numeric value.

Comparing Strings Instead of Integers

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If CPU_USAGE is not an integer, this condition will trigger the error.

Steps to Resolve

Step 1: Verify Variable Content
Print the variable to ensure it holds the expected numeric value.

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This helps ensure that the variable CPU_USAGE contains a number and not an unexpected string or empty value.

Step 2: Use Integer Comparison
When comparing values in an if statement, use -ge, -le, -gt, -lt, and -eq operators for numerical comparisons.

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Step 3: Ensure Correct Data Type
Use bc or shell arithmetic to force proper numerical evaluation.

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Full Example Script

Here’s an example script that combines these steps to avoid the integer expression expected error:

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Summary
To fix the integer expression expected error in your CPU usage script, you should:

Verify that your variables contain numeric values.

Use the correct operators for numerical comparisons.

Employ tools such as bc for accurate arithmetic operations.

By following the steps outlined above, you can ensure that your Bash script runs smoothly without encountering integer expression expected errors.