List common shell builtin examples.

Here are some common shell builtin examples:

1. cd - Change the current directory.
2. echo - Display a line of text or a variable value.
3. exit - Exit the shell or terminate a script.
4. set - Set or unset shell options and positional parameters.
5. unset - Remove variable or function names.
6. alias - Create an alias for a command.
7. export - Set environment variables for child processes.
8. history - Display the command history.
9. pwd - Print the current working directory.
10. fg - Bring a background job to the foreground.

These builtins are integral to shell operation and provide essential functionality without needing external programs.