"zsh: command not found: docker"

 You're seeing the "zsh: command not found: docker" error because the docker command isn't recognized by your Zsh shell. This likely means that Docker's command-line interface (CLI) isn't installed, or its location isn't included in your shell's $PATH variable.

Here's how to fix this:

1. Check if Docker is Installed

First, you need to confirm if Docker Desktop for Mac is installed on your MacBook Pro. The Docker CLI tool is bundled with Docker Desktop, and you should install it via the official Docker website.

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2. If Docker is not Installed

If Docker is not on your computer, you can download and install it from the official website. This will automatically install the necessary CLI tools and configure your $PATH.

• Download: Go to the Docker website.

• Install: Open the downloaded .dmg file and drag the Docker icon to your Applications folder.

• Run: Launch Docker Desktop from your Applications folder. You may need to log in to get it to run.

• Verify: Open a new Terminal window and run docker --version. This should confirm the installation.

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3. If Docker is Installed but not in the Path

If you already have Docker Desktop installed, but you are still seeing this error, the path to the Docker CLI might not be correctly set up. Docker Desktop should handle this automatically on installation, but if it doesn't, you can add it to your .zshrc file:

• Open your .zshrc file: In your terminal, run nano ~/.zshrc or vi ~/.zshrc.

• Add the path: Add the following line to the end of the file:

  export PATH="/Applications/Docker.app/Contents/Resources/bin:$PATH"

• Save and close:

  • For nano, press Control + X, then Y, then Enter.

  • For vi, press Escape, then type :wq, and press Enter.

• Reload the shell: To apply the changes, run source ~/.zshrc or simply open a new terminal window.

4. Correcting the Original Command

Once you have verified Docker is properly installed and in your $PATH, you can then run the original command to add the Zsh completion script.

• Correct command: The command you used was correct in its syntax, it just couldn't find the docker command.

• Verify the path: Ensure the target directory for the completion script exists: ~/.oh-my-zsh/completions/

• Run again: After the previous steps, try the command again:

  docker completion zsh > ~/.oh-my-zsh/completions/_docker