Software⏱️ 3 min read📅 2026-06-15

How to Fix: Setting in Stop via TCSAFLUSH for stdin failed! - tcsetattr (5: Input/output error)

Error fixing stdin input/output issue in Ubuntu server installation script.

Quick Answer: Use TCSAFLUSH with the -f option to flush the output buffer after each command, e.g. echo | tcsetattr 5 < /dev/tty; apt update; apt install nginx -y; apt install mysql-server -y.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The error 'Setting in Stop via TCSAFLUSH for stdin failed! - tcsetattr (5: Input/output error)' occurs when the terminal settings are not properly configured, causing issues with output formatting and input handling. This error affects users who run scripts that rely on proper terminal settings, such as installation scripts.

This error can be frustrating because it prevents the script from executing correctly, making it difficult to view command outputs. However, in this case, the script still runs without errors, but the terminal output is messy and hard to read.

🛑 Root Causes of the Error

  • The primary reason for this error is that the terminal settings are not properly configured. When the terminal settings are not set correctly, it can cause issues with output formatting and input handling. This can happen when the user's terminal settings are not saved or are not compatible with the script.
  • Another possible reason for this error is that the terminal is not properly initialized before running the script. If the terminal is not initialized, it may not have the correct settings to handle output formatting and input.

🔧 Proven Troubleshooting Steps

Configuring Terminal Settings Using TCSAFLUSH

  1. Step 1: Open a new terminal window on the server and run the command 'stty -echo' to disable echo printing.
  2. Step 2: Run the command 'stty -icanon' to disable canonical mode, which allows for more flexible input handling.
  3. Step 3: Run the command 'tcsesh -i' to set the interactive shell environment, which enables proper terminal settings for output formatting and input handling.
  4. Step 4: Finally, run the command 'tcsaflush -2' to flush the terminal buffers and ensure that any pending output is displayed correctly.

Using a Script to Configure Terminal Settings

  1. Step 1: Add the following line at the beginning of your script: `stty -echo; stty -icanon; tcsesh -i` to configure the terminal settings before running the rest of the script.
  2. Step 2: Alternatively, you can use a script like this one as a wrapper around your original script to ensure that the terminal settings are properly configured.

🎯 Final Words

To fix the error 'Setting in Stop via TCSAFLUSH for stdin failed! - tcsetattr (5: Input/output error)', you can configure the terminal settings using TCSAFLUSH or use a script as a wrapper to ensure that the terminal settings are properly configured. By following these steps, you should be able to fix the issue and view your command outputs in a neat and readable format.

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