ast_comparator/test/student_data/handout/shlab-handout/cases/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 (!strcmp(argv[0], "quit")) {       
    exit(0);
  }
  else if (!strcmp(argv[0], "bg") || !strcmp(argv[0], "fg")) {
    do_bgfg(argv);
    return 1;
  }
  else if (!strcmp(argv[0], "jobs")) {
    listjobs(jobs);
    return 1;
  }
  else if (!strcmp(argv[0], "&")) {
    return 1;
  }
  return 0;     
}
int builtin_cmd ( char * * argv ) { if ( ! strcmp ( argv [ 0 ] , " " ) ) { exit ( 0 ) ; } else if ( ! strcmp ( argv [ 0 ] , " " ) || ! strcmp ( argv [ 0 ] , " " ) ) { do_bgfg ( argv ) ; return 1 ; } else if ( ! strcmp ( argv [ 0 ] , " " ) ) { listjobs ( jobs ) ; return 1 ; } else if ( ! strcmp ( argv [ 0 ] , " " ) ) { 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 .
/* if it is built in command, run that command */ // quit /* not a builtin command */