add ls; simpler pwd

Makefile

@@ -1,8 +1,8 @@
 include config.mk
 
-LIB = util/afgets.o util/enmasse.o util/eprintf.o util/recurse.o
+LIB = util/afgets.o util/agetcwd.o util/enmasse.o util/eprintf.o util/recurse.o
 SRC = basename.c cat.c chown.c date.c dirname.c echo.c false.c grep.c head.c \
-      ln.c mkfifo.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
+      ln.c ls.c mkfifo.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
 OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
 MAN = $(SRC:.c=.1)
@@ -11,7 +11,7 @@ all: $(BIN)
 
 $(OBJ): util.h
 $(BIN): util.a
-grep: text.h
+grep.o: text.h
 
 .o:
 	@echo CC -o $@