int main(void) {
char cmdline[MAXLINE];
char *argv[MAXARGS];
int argc;
int status;
pid_t pid;

/* Loop forever to wait and process commands */
while (TRUE) {
   /* Print your shell name: csc60mshell (m for mini shell) */
   printf("csc60msh > ");

   /* Read the command line */
   fgets(cmdline, MAXLINE, stdin);

   /* Call parseline to build argc/argv: their limits declared above */

   argc = parseline(cmdline, argv);

   /* If user hits enter key without a command, continue to loop again at the beginning */
   /* Hint: if argc is zero, no command declared */
   /* Hint: look up for the keyword "continue" in C */

   if (argc == 0) {
         continue;
   }

   /* Handle build-in command: exit, pwd, or cd */

   if (strcmp(argv[0], "exit") == 0) {
         break;
   }

   if (strcmp(argv[0], "pwd") == 0) {
         char * path = (char *) calloc(MAX_PATH_LENGTH, sizeof (char));

         if (getcwd(path, MAX_PATH_LENGTH) == NULL) {
            perror("getcwd() error");
         } else {

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