import os
import re
import signal
import readline  # 用于支持历史记录

# 标志位，用于处理信号
interrupted = False

def signal_handler(signal, frame):
    global interrupted
    interrupted = True  # 设置标志位

signal.signal(signal.SIGINT, signal_handler)

os.system('clear')
print(f"Last login: Tue Apr  1 20:23:24 on ttys001")

def shell():
    dir = os.getcwd()
    if dir == '/':
        CmdDir = '/'
    elif re.match(dir, "/home/*"):  # 用户目录下的任意文件夹
        CmdDir = '~'
    else:
        CmdDir = dir.split('/')[-1]
    print(f'20250910553@何相龙 {CmdDir} % ', end='')
    cmd = input().strip()  # 去除输入中的多余空白字符，包括换行符
    if cmd:  # 如果输入不为空，保存到历史记录
        readline.add_history(cmd)
        os.system(cmd)

while True:
    if interrupted:
        print("\nSignal received. Type 'exit' to quit.")
        interrupted = False  # 重置标志位
    shell()