--- a/ie-virsh.c	Tue Aug 26 06:51:06 2014 -1000
+++ b/ie-virsh.c	Tue Sep 02 08:10:27 2014 -1000
@@ -220,7 +220,7 @@
 
     int account_type = check_user_name(name);
     if (account_type < 0) {
-        fprintf(stderr, "Parmission denied. :%s", name);
+        fprintf(stderr, "Parmission denied. :%s\n", name);
     }
 
 
@@ -243,6 +243,21 @@
     char *vm_name = (char *)malloc(sizeof(char) * VM_NAME_LENGTH);
     vm_name[0] = '\0';
     if (strncmp(argv[1], "list", 4) != 0) {
+        const char *regex = "0[1-4]";
+        regex_t *num_pattern = NEW(regex_t);
+
+        if (regcomp(num_pattern, regex, REG_EXTENDED|REG_NEWLINE) != 0) {
+            exit(0);
+        }
+
+        int ret = regexec(num_pattern, argv[2], (size_t) 0, NULL, 0);
+        regfree(num_pattern);
+
+        if (ret){
+            fprintf(stderr, "This name is not number: %s\n", argv[2]);
+            exit(0);
+        }
+
         make_vm_name(vm_name, account_type, name, argv[2]);
     }