shell

FILE :

	makefile 
	my_shell.c

guidance:

1. Put makefile and my_shell in the folderwerwer

2. then use terminal to run the two files

3. when you run "history" command, you need to modify the txt name and

the path of the txt file in code.(line 192 and line 232)

4.type "make run" or "make" to get the answer