What do I do if the MySQL command line login is stuck?

When the MySQL command line login is stuck, it might be caused by the following reasons:

1. The username or password entered is incorrect: Please make sure that the username and password entered are correct. Try entering the username and password again, and ensure that the capitalization matches.
2. Troubleshooting network connection: Make sure your network connection is stable. Use the ping command or other networking tools to test if the connection to the MySQL server is working properly.
3. There may be an issue with the MySQL server. Try restarting the MySQL server and then attempting to login again.

If none of the above methods have solved the problem, you can try the following method:

1. Check the error log of the MySQL server: Look for the error log of the MySQL server, usually found in the server’s configuration file. Check for any login-related error messages in the error log.
2. Try using a different client tool to connect to the MySQL server: Use other MySQL client tools (such as phpMyAdmin, Navicat, etc) to connect to the MySQL server and see if you can successfully log in. If other client tools also cannot log in, it may be due to configuration or settings issues on the MySQL server.
3. Check the firewall settings: Make sure that the port for the MySQL server (default is 3306) is not blocked if the firewall is enabled on the server. You can try temporarily disabling the firewall for testing purposes.

If the issue still cannot be resolved, it is recommended to consult the official MySQL documentation or seek professional technical support.