mysh: mysh.c
	gcc -g3 -O0 -o mysh mysh.c
myls: myls.c
	gcc -g3 -O0 -o myls myls.c
inode: inode.c
	gcc -g3 -O0 -o inode inode.c

# In 'cat mysh.in | ...', 'mysh.in' uses 'ls -g -o' instead of 'ls -l'.
# This is because the student has a different username and group.
# So, 'ls -g -o' omits the username and group so that the 'diff' is correct.
#################################
# NOTE: ./myls /usr/bin was not actually executed originally.
#             Trying: ./myls /usr/bin
#             was in a comment, but not executed.  I have removed
#             the comment about "Trying" - G.C.
#################################
check: mysh myls inode
	echo "Trying:  ./mysh"
	echo 'ls -l' | ./mysh
	@ echo ""
	@ # NOTE: '2>&1' means redirect stderr (fd 2) to stdout (fd 1)
	echo "Testing extended./mysh test"
	cat mysh.in | ./mysh 2<&1 | diff --ignore-all-space - mysh.out
	@ echo "If no output above, then extended test of ./mysh test succeeded"
	@ echo ""
	echo "Trying:  ./myls /usr/bin/ls"
	./myls /usr/bin/ls
	@echo ""
	@ echo "Comparing xv6-sh.c and mysh.c"
	diff xv6-sh.c mysh.c | grep '^>' | wc -l
	@ echo "Comparing ls.c and myls.c"
	diff xv6-ls.c myls.c | grep '^>' | wc -l
	@echo ""
	@ echo "Print the inode of /usr/bin/ls."
	./inode /usr/bin/ls

clean:
	rm -f mysh myls