Provided by: login_4.8.1-2ubuntu2_amd64
nologin - 礼貌地拒绝登录
The nologin command displays a message that an account is not available and exits non-zero. It is intended as a replacement shell field for accounts that have been disabled. To disable all logins, investigate nologin(5). If SSH_ORIGINAL_COMMAND is populated it will be logged.
The nologin command appeared in BSD 4.4.