使用终端命令 ```bash grep -c "mail=" /etc/passwd ``` 使用 Python 脚本 ```python import subprocess def count_email_accounts(): """Counts the number of email accounts registered on the system.""" Execute the command to get the list of email accounts. output = subprocess.run( ["grep", "-c", "mail=", "/etc/passwd"], stdout=subprocess.PIPE, ).stdout.decode("utf-8") Return the count of email accounts. return int(output.strip()) print(count_email_accounts()) ``` 使用 Bash 脚本 ```bash !/bin/bash Count the number of email accounts registered on the system. email_count=$(grep -c "mail=" /etc/passwd) Print the count. echo $email_count ```