ast_comparator/test/student_data/handout/shlab-handout/cases/prev_2_tsh.c
/*
 * builtin_cmd - If the user has typed a built-in command then execute
 *    it immediately.
 */
If the user has typed a built-in command then execute
it immediately.
If the user has typed a built - in command then execute it immediately .
int builtin_cmd(char **argv)
{
   if (argv[0] == NULL)
      return 1;
   else if (!strcmp(argv[0], "jobs"))
   {
      listjobs(jobs);
      return 1;
   }
   else if (!strcmp(argv[0], "quit"))
   {
      exit(0);
   }
   else if (!strcmp(argv[0], "bg") || !strcmp(argv[0], "fg"))
   {
      do_bgfg(argv);
      return 1;
   }
   return 0;     
}
int builtin_cmd ( char * * argv ) { if ( argv [ 0 ] == NULL ) return 1 ; else if ( ! strcmp ( argv [ 0 ] , " " ) ) { listjobs ( jobs ) ; return 1 ; } else if ( ! strcmp ( argv [ 0 ] , " " ) ) { exit ( 0 ) ; } else if ( ! strcmp ( argv [ 0 ] , " " ) || ! strcmp ( argv [ 0 ] , " " ) ) { do_bgfg ( argv ) ; return 1 ; } return 0 ; }
builtin_cmd - If the user has typed a built-in command then execute
    it immediately.
builtin_cmd - If the user has typed a built - in command then execute it immediately .
/* not a builtin command */