None of these work without the proper # of arguments so print usage

cp.c

@@ -5,6 +5,12 @@
 #include "fs.h"
 #include "util.h"
 
+static void
+usage(void)
+{
+	eprintf("usage: %s source... dest\n", argv0);
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -18,6 +24,9 @@ main(int argc, char *argv[])
 		exit(EXIT_FAILURE);
 	} ARGEND;
 
+	if (argc < 2)
+		usage();
+
 	if(argc > 2 && !(stat(argv[argc-1], &st) == 0 && S_ISDIR(st.st_mode)))
 		eprintf("%s: not a directory\n", argv[argc-1]);
 	enmasse(argc, argv, cp);