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Shell Configuration

Bash and Zsh both have configuration files that run automatically each time you start a new shell session. These files are used to set up your shell environment. They can be used to set up aliases, functions, and environment variables.

These files are located in your home directory (~) and are hidden by default. The ls command has a -a flag that will show hidden files:

ls -a ~

If you're using Bash, .bashrc is probably the file you want to edit.
If you're using Zsh, .zshrc is probably the file you want to edit or create if it doesn't yet exist.

Assignment

As part of your audit, you're trying to figure out what shell commands run automatically when a user logs in on the machine. You need to confirm which shell configuration file is being used.

Edit the file you believe to be your shell configuration file. You can use the nano command to edit files in your terminal:
```
nano ~/.bashrc
# or, if you're using Zsh:
nano ~/.zshrc
```
In nano, use Ctrl+O to save the file (confirm any prompts with Enter), then Ctrl+X to exit. The command list is at the bottom of the screen.
Add the following line to the bottom:
```
echo "Hello from the shell!"
```
Close your terminal and open a new one. If you see the message Hello from the shell!, you've found the right file!
Edit the same shell config file again to remove the line you added so that you don't see that message every time you open a new shell.

Answer the question.