How do I fix: 🛑 Root Causes of the Error?

The problem arises from the way pipes work in Unix-like systems. When you pipe standard error to a file using the `tee` command, it redirects all subsequent output to that file as well.This can lead to unexpected behavior when running your script directly from the command line.

How do I fix: Using a subshell?

Step 1: Another approach is to use a subshell to capture standard error separately.Step 2: For example: `( ./script.sh ) | tee -a $logfile; 2>/dev/null`Step 3: This way, the main script will still show standard output in the log file, while capturing standard error in a separate subshell.

Coding⏱️ 3 min read📅 2026-06-11

How to Fix: Pipe standard error to file and keep it on standard error?

Q: Best Solutions to Fix It Using the `&` operator?

Step 1: To achieve this, you need to use the `&` operator instead of `2>&1`. This will ensure that standard error is redirected to the pipe, but still remain on standard error for command-line execution.Step 2: For example: `./script.sh | tee -a $logfile & 2>/dev/null`Step 3: This

How to pipe standard error to file and keep it on standard error in AIX 7.1 ksh.

Quick Answer: Use the `&` operator to redirect standard error, then use `tee` to write to a log file.

📋 Table of Contents

🛑 Root Causes of the Error
✅ Best Solutions to Fix It
💡 Conclusion

The issue you're facing is a common problem when trying to log both standard output and standard error in a script. If you run your script directly from the command line, it will always show all standard output and standard error. However, if you want to pipe standard error to a file while still keeping it on standard error for command-line execution, there is a solution.

This issue can be frustrating because it requires you to find a balance between logging important information and preserving the original output of your script.

🛑 Root Causes of the Error

The problem arises from the way pipes work in Unix-like systems. When you pipe standard error to a file using the `tee` command, it redirects all subsequent output to that file as well.
This can lead to unexpected behavior when running your script directly from the command line.

✅ Best Solutions to Fix It

Using the `&` operator

Step 1: To achieve this, you need to use the `&` operator instead of `2>&1`. This will ensure that standard error is redirected to the pipe, but still remain on standard error for command-line execution.
Step 2: For example: `./script.sh | tee -a $logfile & 2>/dev/null`
Step 3: This way, when you run your script directly from the command line, it will only show standard output in the log file.

Using a subshell

Step 1: Another approach is to use a subshell to capture standard error separately.
Step 2: For example: `( ./script.sh ) | tee -a $logfile; 2>/dev/null`
Step 3: This way, the main script will still show standard output in the log file, while capturing standard error in a separate subshell.

💡 Conclusion

By using either of these methods, you can achieve your goal of logging standard output and standard error separately. Remember to test your solution thoroughly before deploying it in production.

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