Software⏱️ 3 min read📅 2026-06-15

How to Fix: Getting ": command not found" (: is a colon) error starting a terminal

Terminal error fix for colon command not found and syntax errors in .bashrc.

Quick Answer: Check and remove any invalid or extra shell options, and ensure the bash version is compatible with your terminal emulator.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

The ': command not found' error is a common issue that affects users who are trying to start a terminal session on their system. This error occurs when the system cannot find the colon (:) command, which is used for various shell options and configurations.

This error can be frustrating because it prevents users from accessing the terminal, making it difficult to perform tasks such as navigating through directories, running commands, or using shell features like syntax highlighting.

💡 Why You Are Getting This Error

  • The primary reason for this error is a syntax error in the user's ~/.bashrc file. The colon (:) command is used to specify shell options and configurations, but if it is misspelled or not properly formatted, the system will throw an error.
  • Another possible cause of this error is that the user has added a new shell option or configuration that is not compatible with their current shell version.

🚀 How to Resolve This Issue

Updating the ~/.bashrc file

  1. Step 1: Step 1: Open the ~/.bashrc file in a text editor using the following command: `nano ~/.bashrc` (or use your preferred text editor).
  2. Step 2: Step 2: Locate the line that is causing the syntax error and correct it. If you are not sure what line is causing the issue, try commenting out all lines above the error line to see if the system can still start.
  3. Step 3: Step 3: Save the changes to the ~/.bashrc file by pressing Ctrl+X, then Y, then Enter.
  4. Step 4: Step 4: Restart the terminal session or run `source ~/.bashrc` to apply the changes.

Reverting changes made to the ~/.bashrc file

  1. Step 1: Step 1: Open the ~/.bashrc file in a text editor using the following command: `nano ~/.bashrc` (or use your preferred text editor).
  2. Step 2: Step 2: Look for any recent changes made to the file and revert them. You can do this by deleting all lines added after the last known good version of the file.
  3. Step 3: Step 3: Save the changes to the ~/.bashrc file by pressing Ctrl+X, then Y, then Enter.
  4. Step 4: Step 4: Restart the terminal session or run `source ~/.bashrc` to apply the changes.

🎯 Final Words

To resolve the ': command not found' error, update the ~/.bashrc file to correct any syntax errors and ensure that all shell options and configurations are properly formatted. If you suspect that you have made recent changes to the file, try reverting those changes to restore the original configuration.

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