Admin/exec_process/exec_process.c

 #include <unistd.h>
 
 
 static void fail(const char *msg)
 {
-  printf("%s\n", msg);
+  fprintf(stderr, "%s\n", msg);
   exit(2);
 }
 
 
 int main(int argc, char *argv[])
 {
   /* args */
 
   if (argc != 3) {
-    printf("Bad arguments\n");
+    fprintf(stderr, "Bad arguments\n");
     exit(1);
   }
   char *pid_name = argv[1];
   char *script = argv[2];