[Install POSH](/docs/installation/), then run the commands for your shell once to complete commands and flags with Tab.

## Bash

Requires the `bash-completion` package. On macOS, install it with `brew install bash-completion@2`.

```bash
mkdir -p ~/.local/share/posh
posh completion bash > ~/.local/share/posh/completion.bash
echo 'source ~/.local/share/posh/completion.bash' >> ~/.bashrc
```

## Zsh

```zsh
mkdir -p ~/.zsh/completions
posh completion zsh > ~/.zsh/completions/_posh
echo 'fpath=(~/.zsh/completions $fpath)' >> ~/.zshrc
echo 'autoload -Uz compinit && compinit' >> ~/.zshrc
```

## Fish

Fish loads the script automatically:

```fish
mkdir -p ~/.config/fish/completions
posh completion fish > ~/.config/fish/completions/posh.fish
```

## Try it

Open a new terminal, type `posh `, and press Tab.

New commands and flags appear automatically after upgrading POSH. If completion stops working after an upgrade, run the `posh completion` line for your shell again.