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NOLOGIN(8) System Manager's Manual NOLOGIN(8)

nologin
politely refuse a login

nologin

nologin 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.
If the file /etc/nologin.txt exists, nologin displays its contents to the user instead of the default message.

login(1)

The nologin command appeared in 4.4BSD.
May 31, 2007 OpenBSD-current