Shell Setup and Configuration on macOS

Setting up your shell environment can greatly enhance your productivity on macOS.

Choosing a Shell

macOS comes with several shells pre-installed, including Bash and Zsh. As of macOS Catalina, Zsh is the default shell.

To switch your default shell, use the chsh command:

# Change to Zsh
chsh -s /bin/zsh
 
# Change to Bash
chsh -s /bin/bash

Zsh can be customized using the .zshrc file in your home directory.

Edit .zshrc:
```
nano ~/.zshrc
```
Common Customizations:
- Aliases: Create shortcuts for commands.
```
alias ll='ls -la'
alias gs='git status'
```
- Prompt Customization: Use themes and plugins with Oh My Zsh (opens in a new tab).

Bash can be customized using the .bash_profile or .bashrc file.

Edit .bash_profile:
```
nano ~/.bash_profile
```
Common Customizations:
- Aliases: Create shortcuts for commands.
```
alias ll='ls -la'
alias gs='git status'
```
- Environment Variables: Set variables for your shell session.
```
export PATH="$PATH:/usr/local/bin"
```

Oh My Zsh is a popular framework for managing Zsh configuration.

Installation:

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

Using Themes and Plugins:
- Themes: Change the look of your terminal prompt.
- Plugins: Add functionality to your shell.