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Here are three possible solutions to try:

Check if Homebrew is installed properly:

Type this command in the terminal:

brew doctor

This command will check the Homebrew installation and detect if there are any issues. If there are any problems found, follow the instructions provided by the Homebrew doctor to fix it.

Add Homebrew to your PATH:

Sometimes, the shell may not be able to locate the Homebrew executable file. To fix this issue, you need to add Homebrew to your PATH. Here are the steps:

Open the terminal and type:

nano ~/.zshrc

This will open the zshrc file in the nano text editor.

Add the following line at the end of the file:

export PATH="/usr/local/bin:$PATH"

Save and close the file by pressing CTRL + X, then Y, then Enter.

Restart your terminal and try running the "brew" command again.

Reinstall Homebrew:

If neither of the above solutions works, you may need to reinstall Homebrew. Here are the steps:

Open the terminal and type:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

This will download and execute the Homebrew installation script.

Follow the instructions provided by the installer.

Restart your terminal and try running the "brew" command again.