Software⏱️ 3 min read📅 2026-06-11

How to Fix: What does an `output is not a tty` error mean?

Error occurs when trying to write command output to a file in Git Bash on Windows.

Quick Answer: The error indicates that the output is not being redirected from a terminal, so try using quotes around the filename or redirection operator.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

The `output is not a tty` error occurs when you try to redirect the output of a command that expects user interaction, such as interactive shell prompts or commands with graphical interfaces, to a file. This issue primarily affects users who run commands in environments where the output is expected to be displayed on the screen.

This error can be frustrating because it prevents you from saving the output of an important command to a file. However, don't worry! We'll walk through some steps to help you troubleshoot and fix this issue.

🔍 Why This Happens

  • The primary reason for this error is that the `php -i` command is interactive and expects user input. When you run it in Git Bash on Windows, the output is displayed on the screen by default. However, when you try to redirect the output to a file using `>`, the shell doesn't recognize the redirection operator because it's not running in an interactive mode.
  • An alternative reason might be that your Git Bash environment or configuration has issues with handling command-line redirects.

🚀 How to Resolve This Issue

Enabling Interactive Mode for php -i

  1. Step 1: Open a new terminal window and run the following command: `php -i > info` (without the space between `php` and `-i`). This will enable interactive mode, allowing you to redirect the output to a file.
  2. Step 2: Alternatively, you can use the `-r` option with `php` to specify the redirection operator. Run the command as follows: `php -ri > info`. Note that this method requires careful typing of the redirection operator.
  3. Step 3: If you're still having issues, try adding the `--enable-cli` flag when running `php`: `php --enable-cli -i > info`. This flag enables the CLI mode and allows for proper command-line redirects.

Using a Different Shell or Environment

  1. Step 1: Try running the same command in a different shell, such as PowerShell or Command Prompt. If you're able to redirect the output successfully, it might indicate an issue with your Git Bash environment.
  2. Step 2: Alternatively, you can try changing the configuration of your Git Bash environment to handle command-line redirects properly. You can do this by modifying the `~/.bashrc` file (or equivalent) to include the necessary settings.

🎯 Final Words

In conclusion, the `output is not a tty` error occurs when running interactive commands in environments where output redirection is expected. By enabling interactive mode for the `php -i` command or using a different shell or environment, you should be able to redirect the output to a file successfully.

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