1. chsh

2. echo

3. printf

4. cp

5. ls

6. 리다이렉션

7. set(local 변수)

8. env(글로벌 변수)

9. export

10. alias

11. history

12. PS1

export PS1="\[\033[s\033[0;0H\033[0;41m\033[K\033[1;33m\t\033[0m\033[u\]<\u@\h \W>\$ "

13. .bashrc