--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/usr/mkdir.c	Fri May 26 23:11:05 2017 +0900
@@ -0,0 +1,23 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(int argc, char *argv[])
+{
+    int i;
+    
+    if(argc < 2){
+        printf(2, "Usage: mkdir files...\n");
+        exit();
+    }
+    
+    for(i = 1; i < argc; i++){
+        if(mkdir(argv[i]) < 0){
+            printf(2, "mkdir: %s failed to create\n", argv[i]);
+            break;
+        }
+    }
+    
+    exit();
+}