-Basic Command: cd, pwd, env, exit, unset, export, echo (all other bash commands are implemented with execv)
-Cmd history: arrow key up/down
-Single and double Quotes
-Redirections: < (input), > (trunc), >> (append) and << (heredoc)
-Pipes: single and multible pipe(s), combination with redirections possible
-Environment Variables
-Signals: ctrl-C, ctrl-D and ctrl-\
make
실행파일까지 모두 삭제 : make fclean
obj 파일만 삭제 : make clean
./minishell
