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To enable tab completion, run the following command:
where <shell> is one of bash, zsh or fish.
If you get permission denied error, you can try running the following command:
The commands above will output the completion script to the specified path. Which will look something like this:
The correct method of installing a completion script can depend on both your shell and your configuration.

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Installation

Completions typically will be installed automatically by your shell’s package manager and the script will try to install them.

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Zsh

This example shows how to enable tab completion for zsh, it assumes you are using oh-my-zsh.
Your completion script must have the name in the format of _ followed by the name of the application.
Without oh-my-zsh, you will need to add a path for completion scripts to your function path, and turn on completion script autoloading. First, add these lines to ~/.zshrc:
Next, create a directory at ~/.zsh/completion and copy the completion script to the new directory.

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Bash

If you have bash-completion installed, you can just copy your new completion script to the /usr/local/etc/bash_completion.d or /usr/share/bash-completion/completions directory using the following command:
Without bash-completion, you will need to source the completion script directly. Copy it to a directory such as ~/.bash_completions/, and then add the following line to ~/.bash_profile or ~/.bashrc:

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Fish

To enable tab completion for fish, copy the completion script to the ~/.config/fish/completions or /usr/share/fish/completions directory using the following command: