diff --git a/src/userprog/process.c b/src/userprog/process.c
index adffb00..9d4b3fc 100644
--- a/src/userprog/process.c
+++ b/src/userprog/process.c
@@ -38,7 +38,7 @@ static bool load (const char *cmdline, void (**eip) (void), void **esp);
    before process_execute() returns.  Returns the new process's
    thread id, or TID_ERROR if the thread cannot be created. */
 tid_t
-process_execute (const char *file_name) 
+process_execute (const char *cmd) 
 {
   char *fn_copy;
   tid_t tid;
@@ -51,10 +51,10 @@ process_execute (const char *file_name)
 
   /* Imposing implicit limit that the command line arguments
     including the user program name fit within a single page. */
-  strlcpy (fn_copy, file_name, PGSIZE);
+  strlcpy (fn_copy, cmd, PGSIZE);
 
   /* Create a new thread to execute FILE_NAME. */
-  tid = thread_create (file_name, PRI_DEFAULT, start_process, fn_copy);
+  tid = thread_create (cmd, PRI_DEFAULT, start_process, fn_copy);
   if (tid == TID_ERROR)
     palloc_free_page (fn_copy); 
   return tid;
@@ -66,7 +66,7 @@ static void *push_to_stack (void **esp, void *data, size_t data_size);
 /* A thread function that loads a user process and starts it
    running. */
 static void
-start_process (void *file_name_)
+start_process (void *cmd)
 {
   struct intr_frame if_;
   bool success;
@@ -74,7 +74,7 @@ start_process (void *file_name_)
    /* Retrieve first argument of command, which is the file name
      of the process. */
   char *saveptr;
-  char *file_name = strtok_r (file_name_, " ", &saveptr);
+  char *file_name = strtok_r (cmd, " ", &saveptr);
   if (strlen (file_name) > FNAME_MAX_LEN)
     file_name[FNAME_MAX_LEN + 1] = '\n';
 
@@ -92,14 +92,14 @@ start_process (void *file_name_)
   /* If load failed, quit. */
   if (!success) 
     {
-      palloc_free_page (file_name_);
+      palloc_free_page (cmd);
       thread_exit ();
     }
 
   /* Initialize user process stack and free page used to store the
      command that executed the process. */
   success = process_init_stack (saveptr, &if_.esp, file_name);
-  palloc_free_page (file_name_);
+  palloc_free_page (cmd);
   
   /* If stack initialization failed, free resources and quit. */
   if (!success)